This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'Gout is a disorder of- \nSelect and explain. \nA. Purine metabolism, B. Pyriniidine metabolism, C. Ketone metabolism, D. Protein metabolism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gout is the most common inflammatory ahritis in men and in older women. It is caused by deposition of monosodium urate monohydrate crystals in and around synol joints due to abnormal purine metabolism . Ref Davidsons 23e p1013', 'role': 'assistant'}]