All are anti-androgens except
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)
Finasteride
Flutamide
Cyproterone acetate
Dihydrotestosteron
Endocrinology