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
Prolonged testosterone treatment to a man results in: 
Select and explain. 
A. Increased spermatogenesis, B. Increased sperm motility, C. Azoospermia, D. Increased gonadotropins
C: Azoospermia
Answer: C: Azoospermia 
Explanation: None