This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Physiology
[{'content': 'Resting membrane potential of nerve fibre is close to isoelectric potential of: \nSelect and explain. \nA. Potassium ions, B. Sodium ions, C. Chloride ions, D. Magnesium ions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: RMP of nerve = -70mVEp of sodium = + 60mVEP of potassium = - 90mV Ep of chloride = -70mV (Same as RMP not closest )', 'role': 'assistant'}]