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': 'A man is given continuous testosterone.It would lead to: \nSelect and explain. \nA. azoospermia, B. increased sperm motility, C. increased spermatogenesis, D. increased gonadotrophins', 'role': 'user'}, {'content': 'Answer: A \nExplanation: azoospermia [Ref: Katzung Pharmacology 10/e p675; Guyton 11/e p1066; KDT 5/e p2911 "Replacement therapy in men may cause acne, sleep apnea, erythrocytosis, gynecomastia, and azoospermia. Supraphysiologic doses of androgens produce azoospermia and decrease in testicular size, both of which may take months to recover after cessation of therapy."', 'role': 'assistant'}]