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': 'After-hyperpolarization during nerve conduction is due to: \nSelect and explain. \nA. Slow entry of Na+, B. Pumping of Na+ outside, C. Slow entry of K+, D. Pumping of K+ outside', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The slow return of the K+ channels to the closed state also explains the after-hyperpolarization, followed by a return to the resting membrane potential.', 'role': 'assistant'}]