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': '5HT2A antagonist drug is ? \nSelect and explain. \nA. Clozapine, B. Cisapride, C. Sumatriptan, D. Ketanserin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Ketanserin", 'role': 'assistant'}]