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
[{'content': 'Treatment of choice in seronegative spondy- larthritis is - \nSelect and explain. \nA. Phenylbutazone, B. Aspirin, C. Indomethacin, D. Corticosteroid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]