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: Medicine
[{'content': 'Which event will NOT occur during depolarization phase? \nSelect and explain. \nA. Na+ channels open, B. Ca+ channels open, C. K+ channels open, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Na+\xa0channels\xa0open, increasing the permeability of the cell membrane to Na+.\xa0Sodiumions then diffuse into the cell, causing depolarization. This causes\xa0K+\xa0channels\xa0to close quickly, decreasing the permeability of the cell membrane to K+. The decreased\xa0diffusion\xa0of K+out of the cell also causes depolarization.\xa0Ca2+\xa0channels\xa0slowly open, increasing the permeability of cell membrane to Ca2+.\xa0Calcium\xa0ions then diffuse into the cell and cause depolarization.', 'role': 'assistant'}]