21. Choice A is the correct answer. Chronic diarrhea is defined is diarrhea persisting for greater than 30 days. Possible causes include carbohydrate malabsorption, maldigestion, malabsorption syndromes, inflammatory bowel disease, radiation colitis, ischemic colitis, neoplasia, laxative abuse, post cholecystectomy, vasculitis, poisons, disordered motility, neuroendocrine tumors, Addison's disease, and idiopathic secretory diarrhea. Norovirus is the most common cause of acute diarrhea. Acute diarrhea lasts less than 14 days.
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