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': 'Central muscle relaxants act by - \nSelect and explain. \nA. Decreased nerve conduction, B. Inhibits spinal polysynaptic reflexes, C. Block conduction across NM junction, D. CNS depression', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Inhibits spinal polysynaptic reflexes Centrally acting muscle relaxants selectively depress spinal and supraspinal polysynaptic reflexes involved in the regulation of muscle tone without significantly affecting monosynaptic mediated stretch reflex.", 'role': 'assistant'}]