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': 'An old man has enlarged prostate. Which of the following may be use to suppress his prostatic growth - \nSelect and explain. \nA. Spironolactone, B. Ketoconazole, C. Finasteride, D. Flutamide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Finasteride o 5-a reductase inhibitors (finasteride) are used in BPH.", 'role': 'assistant'}]