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: Pharmacology
[{'content': 'Prolonged testosterone treatment to a man results in: \nSelect and explain. \nA. Increased spermatogenesis, B. Increased sperm motility, C. Azoospermia, D. Increased gonadotropins', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]