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
[{'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: None', 'role': 'assistant'}]