This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
All are anti-androgens except 
Select and explain. 
A. Finasteride, B. Flutamide, C. Cyproterone acetate, D. Dihydrotestosteron
D: Dihydrotestosteron
Answer: D: Dihydrotestosteron 
Explanation: Testosterone which is a natural androgen is conveed to more active dihydrotestosterone by the enzyme steroid 5alpha-reductase. All others are anti-androgens. Flutamide, nilutamide, bicalutamide are androgen receptor antagonists (Ref.Essential s of medical pharmacology TD Tripathi 7th edition page no.296)