This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': 'Most diffusible ion across membrane: \nSelect and explain. \nA. Na+, B. K+, C. Cl-, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) K+(Ref: Ganong, 25th ed/p.35)At rest, cell membrane is freely permeable for potassium ionThis is the reason behind development of RMP which is due to potassium ion', 'role': 'assistant'}]