Can I get Benefit of OBC Category if Father's income is 5 Lakhs/Annum ?? give me details ?

No, you are not eligible to get advantage of being O.B.C because according to your parent's annual income you come into O.B.C Creamy layer.
If you father income is less than 3.5 lakh than you will get advantages for O.B.C Creamy layer.

Casts under OBC are :
Charodi,Mestha
Gam Gowda, Gam Gawda, Gavada, Kare Vokkalu,
Aghori, Karkarmunda
Kanisan, Kaniyar, Kaniyaru, Kaniya,Kaniyan,
Teluga Banajiga, Setty Balija, Setty Banajiga,
Beshtar, Bunde-Beshta
Bathal,Battal, Batter, Battar
Gabit, Gabbit, Gapit, Gaabit, Daalji,Daavat
Kalal,Goundla, Goondla, Thiyan, Tiyan, Ezhava,Thiyya
Kasbin
Chitrakathijoshi
Simpi, Shimpi, Lingayat Simpy, Sivasimpy, Sai,
Malayali Billava, Deevar, Devaramakkalu, Namdhari,
Bhaat,Bhatraj, Bohrot, Bhatraju
Chapper Band (Muslim)
Takari, Uchillian
Kolayan, Urali
Chambukutti
Mirai, Rangari, Rangrez, Nilari, Namdev,
Kadu Konkani
Chaptegar,Chaptegara
Kavadi
Sappaliga, Sheregar, Servegar, Suplig
Beria
Phulmali, Phulari, Phoolari, Jeer, Lingayat Jeer
Kanate
Kalayiri, Koleri, Kolari
Dasa Banajiga, Naidu, Bhogam/Teluga, Telaga Balija,
Helava,Holeva
Honniyar
Lingayat Neelagar
Karuva
Gondali,Ghondali, Gondaliga, Gondhali, Gondhalli
Bhardi,Bhargi
Gurou
Bogad,Bogadi, Bagadi, Bogodi, Bagaadi, Bagdi, Bagodi
Dombi-Dasaru
Gosavi,Gosayi, Gosain, Atit
Ghadshi, Ghadsi
Howgar,Hawgar, Hawadiga
Chamboti
Jogi,Joger, Sanjogi, Jogar
Hanabaru, Krishna Golla, Anubaru, Atanabaru, Hanbar
Sajjanaganigar, Teli, Gandla
(Other than Kollegal Taluqa of Mysore District),
Hindu Sadaru
Kolhati,Kolhatigi
Talwar,Valmikimakkalu, Vedan, Parivara Nayaka
Anduran
Chaliyan, Teruvan, Challiya
Kasai, Katik, Khatik, Katuka, Katuga, Kasab, Aray
Gujar,Guzar
Kashikapdi, Kashikapadi,Tirumali
Chitara
Digwan, Jingar
Darvesu
Idiga,Ediga, Eliga,Iliga, Halepaik, Billava, Devar,
Binapatta
Kasar,Kansar,Kanchori, Kanchera, Kanchugara, Bogara
Full-Mali,Baghban,Bagban,Bagwan
Kanbi, Kulwadi, Kunbi
Kasban, Mannur/Munnar, Mutrasi, Matracha,
Bandhari
Hoovadiga, Hugar, Hoogar, LingayatHugar/Hoogara
Balasanthoshi
Bairagi, Bava, Bavaji, Byaragi, Bavani
Janapan,Janapachetty, Janapashetty, Janapasetty,
Johari
Hatagar, Lingayat Hatgar
Handevazir
Gangakula, Gangemakkalu, Gangamatha,
Chunchar
Hoogaran, Maalgar, Lingayat Malgar, Mali, Phoolmali,
24 Mane Telugu Shetty, 24 Mane Telugu Chetty,
Bailapatar, Bailpatar, Bilapatar
Dholi
Agasa,Lingayat Agasa, Sakala, Madivala/Madivalaru
Kanjirbhat,Khanjarbhat, Kanjirbhaat
Bawtar
Janappan, Balegara, Lingayat Balegala/Baleshettaru
Javeri, Jawari
Telungupatti Chetty, Telungu Chetty, Telungu Chettiar,
Namdev Simpy, Rangare, Neelagar,
Kabbaliga, Kabbili, Kabber, Kabbera, Kharvi, Bhoi,
Balija, Balajiga,Banajiga, Bale Balajiga,
Giddidki, Pingle, Pingale
Kanjari, Kanjar, Kanjir
Vannan, Dhobi, Parit, Rajaka
Bedaru, Valimiki, Barki, Parivara, Bendar, Berad,
24 Manai Telugu Chetty, 24 Manai Telugu Chettiar,
Ghadi
Halakki Vokkalu, Vakkal, Gram Vakkal,
Chara,Chhar, Chhara
Golla,Gouli,Lingayat gowli/Gauli/Kawadiga, Gopal, Yadav,
Katabu,Katabar
Devadiga, Devadigar, Moili, Moyili, Devadig,Devali,
Darzi, Bhavasar Karshatriya, Chippi, Chippiga,
Bakadra
Haranshikari,Chigaribetegar, Vaghri, Wagiri,
Kahar,Meenagar,Mogaveera,Kharia,Sunagara,
Durgamurga, Burburcha
Sadhu Chetty, Sadhu Shetty, Telugu Chetty,
Kolla, Kollala
Bhavin
Budbudki, Budbudkala, Devari, Joshi
Ambattan
Nirshikari, Bagri, Baori, Phasachari,Vagri
Kanyan, Balyaya
Ganiga,Lingayat Ganiga/Ganigar, Lingayat Sajjan/
Gatti/Gattiyavaru
24 Mane Telugu Chettiar, 24 Manai Telugu Shetty,
Hanabar
Kalkari, Kelkari, Khelkari
Chapper Banda
Karikudumbi
Salaparu, Sanaparu, Sanapar, Salapar, Janapar,
Kamati,Kaman
Atari, Athari
Gangaputra, Gowrimatha, Ambig, Ambiga, Bestha,
Lingayat Bilijedaru/Jeda, Winkar, Julohi, Hulkar,
Kichagara
Ghisadi
Asthanagolla, Yadava, Adavigolla, Gopala, Gopali
Bhamta,Bhompta, Paradeshi Bhampta, Bhomptra,
Bajania, Bajenia
Dang-Dasar
Boya, Naikamakkalu, Naikwadi, Palegar, Remoshi,
Goniga, Sadu Setty, Sadhu Chetty, Sadhu Setty,
Telugu Chettiar, Telugu Shetty, Telugu Setty,
Kavutian
Bazigar
Ambalavasi, Ambalakarma, Ambalakaran
Bhoyi, Boyi, Thoreya, Harakanthra, Hariakanthra,
Agnani
Lingayat Madivala, Sakalavadu, Tsakala, Chakala,
Bingi
Gudigara
Gurav, Lingayat Gurav, Gurov, Tambli, Tamballa, Gurava,
Handervut
Kunchavakkal, Atte Vokkalu, Shilwakkal, Halakkivakkal
Siviyar,Parivara, Galadakonkani
Devanga,Devang, Koshti, Hutgar/Hutkar, Jed,
Gonichetty, Gonigamane
Bahurupi