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: Medicine
[{'content': 'Gout is a disorder of: \nSelect and explain. \nA. Purine Metabolism, B. Pyrimidine Metabolism, C. Ketone Metabolism, D. Protein metabolism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]