If you belong to SEBC, you belont to the borader OBC Category. Now if you belong to OBC Category, the Community you belong to should be listed under Central OBC list. You can check if your Community is listed under Central OBC list or not at: http://www.ncbc.nic.in/User_Panel/CentralListStateView.aspx . If it is listed, you can select OBC as your Category while filling your NEET PG application form. Or else you have to select General Category as yuor Category. But while filling your State Counselling application form for NEET PG, you can select SEBC.