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: Surgery
[{'content': 'Crystal of pseudogout is made up of ? \nSelect and explain. \nA. CPPD, B. Urate, C. Calcium carbonate, D. Xanthine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CPPD", 'role': 'assistant'}]