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
[{'content': 'Lowest chance of recipient failure in transplant is seen in: \nSelect and explain. \nA. Allograft, B. Isograft, C. Xenograft, D. Heterotropic graft', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) IsograftRef: Bailey 26th ed, page 1426* Isograft: A graft between identical donor such as identical twin* Hence the rejection rate is the lowest', 'role': 'assistant'}]