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': 'In a person on a very low potassium diet, which part of the nephron would be expected to reabsorb the most potassium? \nSelect and explain. \nA. A, B. B, C. C, D. D', 'role': 'user'}, {'content': 'Answer: A \nExplanation: About 65% of the ﬁltered K+ is reabsorbed in the proximal tubule, and another 20% to 30% is\xa0 reabsorbed in the loop of Henle. Although most of the daily variation in K+ excretion is caused by\xa0 changes in potassium secretion in the distal tubule and CD (collecting duct), only a small percentage of the ﬁltered K+ load can be reabsorbed in these nephron segments.', 'role': 'assistant'}]