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 is used in the treatment of: \nSelect and explain. \nA. Osteoahritis, B. Gout, C. Rheumatoid Ahritis, D. Ankylosing spondylitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Allopurinol a xanthine oxidase inhibitor is used in the treatment of gout. By inhibiting xanthine oxidase it reduces uric acid synthesis. Ref: Essentials of Medical Pharmacology By KD Tripathi, 5th Edition, Page 191 - 2.', 'role': 'assistant'}]