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': 'Most effective treatment of acute attack of gout is - \nSelect and explain. \nA. Aspirin, B. Allopurinol, C. Colchicine, D. Mefenemic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]