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': 'Centrally acting muscle relaxant with α2 - adrenergic agonist activity is \nSelect and explain. \nA. Chlorzoxazone, B. Baclofen, C. Tizanidine, D. Pirenzepine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tizanidine is a centrally acting muscle relaxant with\xa0α2 - adrenergic activity, but unlike clonidine it has no effect on blood pressure.', 'role': 'assistant'}]