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: Anaesthesia
[{'content': 'Local anaesthesia acts by – \nSelect and explain. \nA. Na+channel inhibition, B. Ca++ channel inhibition, C. Mg++ channel inhibition, D. K+ channel inhibition', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Local anesthetics act by inhibiting Na+ channels from inside.', 'role': 'assistant'}]