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: Surgery
[{'content': 'Local anesthetics block nerve conduction by \nSelect and explain. \nA. Depolarising the nerve membrane reducing threshold potential, B. Decreasing the membrane permeability to Na+ ions there by stabilizing nerve membrane, C. Increasing the membrane permeability to K+ ions and by depolarising nerve membrane, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]