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': 'Testosterone inhibitors are all except ? \nSelect and explain. \nA. Spironolactone, B. Flutamide, C. Finasteride, D. Sildenafil', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Sildenafil", 'role': 'assistant'}]