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Correct answer: C

Rationale: Allopurinol prevents the formation of uric acid crystals.
Reference: Baggott, C., Fochtman, D.,  Foley, G.V., & Patterson Kelly, K. (Eds.). (2011). Nursing care of children and adolescents with cancer and blood disorders. Association of Pediatric Hematology and Oncology Nurses. p. 678.