This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
Sulfa drug used in inflammatory bowel disease includes: 
Select and explain. 
A. Sulfasalazine, B. Sulfamethoxazole, C. Sulfinpyrazone, D. Sulphadoxine
A: Sulfasalazine
Answer: A: Sulfasalazine 
Explanation: the azo bond is split by colonic bacteria to release 5ASA and sulfa pyridine .the former exes a local antiinflammatory effect ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITIION KD TRIPATHI PG NO 683