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': 'Over half of the potassium that appears in the urine of a patient, who has ingested some potassium salts, is derived from \nSelect and explain. \nA. Glomerular filtrate, B. Secretion by the distal tubule, C. Reabsorption in the proximal tubule, D. Secretion by the loop of Henle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In Normal K+ intake -\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The proportion of K+ by filtration in urine- 2/3\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The proportion of K+ by secretion in urine (Distal tubules and collecting duct)- 1/3\nIn High K+ intake- \xa0\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The proportion of K+ by filtration in urine- 1/3\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The proportion of K+ by secretion in urine (Distal tubules and collecting duct)- 2/3', 'role': 'assistant'}]