This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NSAIDs, Gout and Rheumatoid Ahritis, Subject name: Pharmacology
[{'content': 'Which of the following disease modifying anti- rheumatoid drugs is a prodrug? \nSelect and explain. \nA. Etanercept, B. Nimesulide, C. Sulfasalazine, D. Colchicine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Sulfasalazine is a pro-drug. - It dissociates in the colon to produce 5-ASA (MESELAMINE) and sulfapyridine. - 5-ASA is the active moiety in treatment of ulcerative colitis whereas sulfapyridine is used to treat rheumatoid ahritis.', 'role': 'assistant'}]