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': "NERNST's potential of Na+ is \nSelect and explain. \nA. 61, B. -60, C. 90, D. -80", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nernst potential\nNa+- +60mv\nK+- -90mv\nCl- - -70mv', 'role': 'assistant'}]