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
A drug 'X' primarily reduces the static component of urinary obstruction in benign hypertrophy of prostate and takes more than 3 months to exert its beneficial effect. Which of the following is 'X' ? 
Select and explain. 
A. Tamsulosin, B. Terazosin, C. Finasteride, D. Amphetamine
C: Finasteride
Answer: C: Finasteride 
Explanation: None