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': 'The pacemaker potential is due to: \nSelect and explain. \nA. Fast Na+ channel, B. Decrease in K+ permeability, C. Slow Ca++ channel, D. Rapid repolarization', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pacemaker potential is due to slow Na+\xa0>> Rapid Ca++\xa0 >> decrease K+\xa0permeability. So, with\xa0the\xa0provided\xa0 options,\xa0best\xa0answer\xa0is decrease K+\xa0permeability.', 'role': 'assistant'}]