This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
[{'content': 'Time for formation of mature sperm- \nSelect and explain. \nA. 30-35 days, B. 40-45 days, C. 50-55 day, D. 70-75 days', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 70-75 days * In humans, it takes an average of 74 days to form a mature sperm from primitive germ cells.", 'role': 'assistant'}]