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': 'Allopurinol works on the basis of : \nSelect and explain. \nA. Decreased excretion of uric acid, B. Decreased metabolism of uric acid, C. Increased excretion of uric acid, D. Decreased synthesis of uric acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]