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': "The production of mature spermatozoa from spermatogonia: \nSelect and explain. \nA. Takes 32 days, B. Takes 70 days, C. Takes 150 days, D. Is unaffected by Kallmann's syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B. Takes 70 daysIt takes approximately 65 to 70 days to develop spermatozoa from the earliest stages of spermatogonia. Because the production of sperm depends on LH and FSH, a lack of GnRH (Kallmann's syndrome) will reduce the production of LH, FSH, and sperm. Temperature is important in regulating sperm production. Optimal sperm production occurs at 2 to 3_C lower than body temperature.", 'role': 'assistant'}]