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': 'All except one are centrally acting muscle blockers: \nSelect and explain. \nA. Meprobamate, B. Baclofen, C. Diazepam, D. Dantrolene sodium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]