This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'HLA is the major histocompatibility antigen determining homograft rejection. This comes under \nSelect and explain. \nA. Antigen specificity, B. Species specificity, C. Isospecificity, D. Auto specificity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HLA and blood groups come under iso-specificity in which antigens are present in ceain group of subjects in same species Ref: Textbook of Microbiology Baveja 5th ed Pg 94', 'role': 'assistant'}]