This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'In recommending treatment for your carcinoid patient, you will consider all of the following except \nSelect and explain. \nA. Cyproheptadine, B. Ketanserin, C. Methysergide, D. Sumatriptan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All of the drugs listed have significant blocking effects on 5HT receptors except sumatriptan, which is an agonist at 5HT1 receptors.', 'role': 'assistant'}]