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
An old man has enlarged prostate. Which of the following may be use to suppress his prostatic growth: 
Select and explain. 
A. Spironolactone, B. Ketoconazole, C. Finasteride, D. Flutamide
C: Finasteride
Answer: C: Finasteride 
Explanation: None