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': 'An antipsychotic drug with a least extrapyramidal side effect is: \nSelect and explain. \nA. Triflupromazine, B. Thioridazine, C. Pimozide, D. Trifluoperazine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]