This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'The following statements regarding finasteride are true except \nSelect and explain. \nA. It is used in the medical treatment of benign Prostatic hyperophy (BPH), B. Impotence is well documented after its use, C. It blocks the conversion of dihydrotestosterone to testosterone, D. It is a 5 -alpha reductase inhibitor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .Finasteride, is used for the treatment of benign prostatic hyperplasia male pattern baldness. It is a 5a-reductase inhibitor; 5a-reductase, an enzyme, conves testosterone to dihydrotestosterone (DHT) (option 3 its give otherway round) Adverse affects include increased risk for impotence, erectile dysfunction, decreased libido, and ejaculation disorder for the first year of treatment.', 'role': 'assistant'}]