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: Unknown
[{'content': 'The following are causes of secretory diarrhea except \nSelect and explain. \nA. Vibrio cholera, B. Inflammatory bowel disease, C. Lactose intolerance, D. Gastrinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Causes of chronic diarrhea: \n1.Osmotic diarrhea—clues—stool volume decreases with fasting, increased stool osmotic gap;\n(i) Medications—antacids, lactulose, sorbitol,\n(ii) disaccharidase deficiency—lactose intolerance,\n(iii) factitious diarrhea—magnesium (antacids, laxatives).\n\xa0\n2. Secretory diarrhea—clues—large volume (>1 L/day), little change with fasting, normal stool osmotic gap;\n(i) hormonally mediated—vipoma, carcinoid, medullary carcinoma of thyroid (calcitonin), Zollinger—Ellison\nsyndrome (gastrin),\n(ii) factitious diarrhea (laxative abuse), phenolphthalein, cascara, senna,\n(iii) villous adenoma,\n(iv) bile salt malabsorption (ileal resection, Crohn’s ileitis, postcholecystectomy,\n(v) medications.', 'role': 'assistant'}]