This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Afterhyperpolarization due to \nSelect and explain. \nA. Na efflux, B. Na+ influx, C. CI influx, D. K+ efflux', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Slow return of the K+ channels to the closed state thus K+ efflux.(Ref: Textbook of physiology AK Jain 5th edition page no.36)', 'role': 'assistant'}]