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: 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: None