All are anti-androgens except: (A) Finasteride, (B) Flutamide, (C) Cyproterone acetate, (D) Dihydrotestosteron
Answer is D. 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)