This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transplantation, Subject name: Surgery
Most important HLA for organ transplantation and tissue typing: 
Select and explain. 
A. HLA-A, B. HLA-B, C. HLA-C, D. HLA-D
D: HLA-D
Answer: D: HLA-D 
Explanation: Ans. (d) HLA-DRef: Bailey 26th edition, Pages 1409-1412* HLA- A, B, DR are the most important antigens in transplant* HLA antigens are the most common cause of graft rejection* HLA- DR is the most important of all* Anti HLA antibodies causes hyper acute rejection.