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': 'One of the following is not a 5–HT receptor antagonist : \nSelect and explain. \nA. Ketanserin, B. Lanreotide, C. Methysergide, D. Tropisetron', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lanreotide is a somatostatin analog used in acromegaly.', 'role': 'assistant'}]