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: Physiology
[{'content': 'Antibodies against sperms may develop after: \nSelect and explain. \nA. Trauma, B. Infection, C. Vasectomy, D. Orchidectomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Vasectomy 50% of men who have been vasectomized develop antibodies against spermatozoaQ. This holds significance, as because of these antibodies reversal of vasectomy may not restore feility, even when the reversal is successful.', 'role': 'assistant'}]