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: Medicine
[{'content': 'The newer aminosalicylate with side effect of watery diarrhea caused by increased secretion of fluid in the small bowel is: \nSelect and explain. \nA. Olsalazine, B. 5-ASA, C. Mesalamine, D. Balsalazide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Olsalazine is composed of two 5-ASA radicals linked by an azo bond, which is split in the colon by bacterial reduction, and two 5-ASA molecules are released. MUST KNOW: Olsalazine is similar in effectiveness to sulfasalazine in treating UC, but up to 17% of patients experience nonbloody diarrhea caused by increased secretion of fluid in the small bowel. ALSO KNOW: Balsalazide contains an azo bond binding mesalamine to the carrier molecule 4-aminobenzoyl--alanine; it is effective in the colon. Ref: Harrison, Edition-18, Page-2489.', 'role': 'assistant'}]