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
Allopurinol works on the basis of : 
Select and explain. 
A. Decreased excretion of uric acid, B. Decreased metabolism of uric acid, C. Increased excretion of uric acid, D. Decreased synthesis of uric acid
D: Decreased synthesis of uric acid
Answer: D: Decreased synthesis of uric acid 
Explanation: None