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
Crystal of pseudogout is made up of ? 
Select and explain. 
A. CPPD, B. Urate, C. Calcium carbonate, D. Xanthine
A: CPPD
Answer: A: CPPD 
Explanation: Ans. is 'a' i.e., CPPD