This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Nerve depolarization is due to \nSelect and explain. \nA. Opening of sodium channels, B. Opening of chloride channels, C. Opening of potassium channels, D. Opening of calcium channels', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When sodium ion enters a cell the potential goes positive side and this is depolarization phase. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 26)', 'role': 'assistant'}]