This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Central Nervous System, Subject name: Physiology
[{'content': 'Which ion has the lowest electrochemical driving force in a typical neuron with a resting membrane potential of -65 millivolts? \nSelect and explain. \nA. Chloride, B. Potassium, C. Sodium, D. Calcium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The equilibrium potential for chloride averages about -70 millivolts in a typical neuron, so with a resting membrane potential of 65 millivolts, the electrochemical driving force for chloride is 5 millivolts. In case of neuron, equilibrium potential for: Potassium: -90 mV Sodium: +60 mV Calcium: +129 mV', 'role': 'assistant'}]