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
The newer aminosalicylate with side effect of watery diarrhea caused by increased secretion of fluid in the small bowel is: 
Select and explain. 
A. Olsalazine, B. 5-ASA, C. Mesalamine, D. Balsalazide
A: Olsalazine
Answer: A: Olsalazine 
Explanation: 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.