This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
True about febuxostat: 
Select and explain. 
A. Anti-gout and Xanthine Oxidase inhibitor, B. Purine inhibitor, C. Dose adjustment required in renal impairment, D. Has uricosuric action
A: Anti-gout and Xanthine Oxidase inhibitor
Answer: A: Anti-gout and Xanthine Oxidase inhibitor 
Explanation: Ref: Katzung's Pharmacology, 14th ed. pg. 662-63* Febuxostat is a non-purine inhibitor of xanthine oxidase and thereby reduces the formation of xanthine and uric acid and is useful in management of gout.* It is 80% absorbed following oral administration and extensively metabolized in the liver.* All of the drug and its metabolites appear in the urine although less than 5% appears as unchanged drug. Because it is highly metabolized to inactive metabolites, no dosage adjustment is necessary for patients with renal impairment.