A 52-year-old woman presents with pain in her right knee. The knee is red, warm, and swollen. Serum uric acid is 11.4mg/dL. Joint fluid aspiration shows negatively birefringent crystals. Indomethacin therapy is started and she begins a purine-restricted diet. One week later, her 24-hour urinary uric acid excretion is 800mg/day (N=300-600mg/day). Which of the following drugs is most appropriate to decrease the serum uric acid concentration in this patient?
A) Allopurinol B) Aspirin C) Colchicine D) Probenecid E) Sulfinpyrazone