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
Testosterone inhibitors are all except ? 
Select and explain. 
A. Spironolactone, B. Flutamide, C. Finasteride, D. Sildenafil
D: Sildenafil
Answer: D: Sildenafil 
Explanation: Ans. is 'd' i.e., Sildenafil