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': 'When sodium enters cells \nSelect and explain. \nA. There is spike in action potential, B. There is plateau in action potential, C. There is repolarization, D. There is hyperpolarization', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When sodium ion enter a cell the potential goes to the positive side and cause depolarization. There is a spike in action potential.(REF TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 26)', 'role': 'assistant'}]