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': 'Acanthosis nigricans is caused by wihch drug- \nSelect and explain. \nA. Amphotericin-B, B. Ketoconazole, C. Nicotinic acid, D. Nalidixic acid', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Nicotinic acid o The cutaneous effects of nicotinic acid include flushing and pruritis of face and upper trunk, skin rashes and acanthosis nigricans. These symptoms are due to vasodilatory action of niacin through release of PGs and can be prevented by pretreatment with aspirin.", 'role': 'assistant'}]