This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'All of the following drugs are Antiandorgens EXCEPT \nSelect and explain. \nA. Cemitidine, B. Cyproterone, C. Spironolactone, D. Cyproheptadine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Cyproheptadine # Impeded Androgens / Antiandrogens> Estrogens may be called antiandrogenic in a limited sense.> Some of their actions are opposite to that of testosterone.> Further, by inhibiting Gn secretion they decrease testosterone production.> Superactive GnRH agonists are the most potent inhibitors of gonadal function.> The antifungal drug ketoconazole decreases testosterone production.> Cemitidine and spironolactone have weak antiandrogenic action which manifests as side effects.> Progesterone has weak androgen receptor blocking action.> Some testosterone and progesterone derivatives act as partial agonists and antagonists at androgen receptor.', 'role': 'assistant'}]