HLA is the major histocompatibility antigen determining homograft rejection. This comes under: (A) Antigen specificity, (B) Species specificity, (C) Isospecificity, (D) Auto specificity
Answer is C. 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