This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'Normal FSh levels in adult male is \nSelect and explain. \nA. 10-20 IU/L, B. 20-40 IU/L, C. 40-60 IU/L, D. 60-80 IU/L', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Before pubey - 0 to 4.0 mIU/mL (0 to 4.0 IU/L) During pubey - 0.3 to 10.0 mIU/mL (0.3 to 10.0 IU/L) Women who are still menstruating - 4.7 to 21.5 mIU/mL (4.5 to 21.5 IU/L) After menopause - 25.8 to 134.8 mIU/mL (25.8 to 134.8) Ref: guyton and hall textbook of medical physiology 12 edition page number:636,637,638', 'role': 'assistant'}]