This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The drug which blocks both H1 and 5ht2 receptor is \nSelect and explain. \nA. Phenoxybenzamine, B. Cyproheptadine, C. Ritanserin, D. Ondonsetron', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cyproheptadine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyes/nose, sneezing, hives, and itching. It works by blocking a ceain natural substance (histamine) that your body makes during an allergic reaction. Refer kDT 7/e p170', 'role': 'assistant'}]