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': 'Dr. Christian Bernard preformed the Ist hea transplant in the year - \nSelect and explain. \nA. 1962, B. 1965, C. 1969, D. 1967', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 1967", 'role': 'assistant'}]