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
[{'content': 'The following statements regarding finasteride are true EXCEPT: \nSelect and explain. \nA. It is used in the treatment of benign prostatic hyperplasia, B. Impotence is well documented alter its use, C. It blocks the conversion of dihydrolestosteron to testosterone, D. It is a 5 a reductase inhibitor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Finasteride is a competitive inhibitor of enzyme 5 alpha-reductase which conves testosterone into DHT. DHT is a more powerful androgen than testosterone It is used for the treatment of BPH and androgenic alopecia Adverse effect-cause impotence.(Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.302)', 'role': 'assistant'}]