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: 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: Prolonged use of testosterone may produce testicular atrophy thus causing azoospermia. (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.299)