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: Physiology
[{'content': 'Resting membrane potential is close to the isoelectrical potential of: \nSelect and explain. \nA. Na., B. Cl., C. K, D. Mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Resting membrane potential of nerve is -70 mvd/t K channels. And it is equal to equilibrium potential of chloride ion (-70 mv).', 'role': 'assistant'}]