This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Kidney transplant from a mother to son is known as \nSelect and explain. \nA. Autograft, B. Allograft, C. Heterograft, D. Xenograft', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Autograft - transplant from the same person.\nIsograft - transplant from twins.\nAllograft - transplant from same species.', 'role': 'assistant'}]