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 drugs is useful in chronic gout but is NOT a uricosuric agent ? \nSelect and explain. \nA. Probenecid, B. Phenylbutazone, C. Sulfinpyrazone, D. Allopurinol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]