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
Crystals deposited in Pseudogout: March 2013 (d) 
Select and explain. 
A. Sodium biurate, B. Calcium oxalate, C. Sodium pyrophosphate, D. Amyloid
C: Sodium pyrophosphate
Answer: C: Sodium pyrophosphate 
Explanation: Ans. C i.e. Sodium pyrophosphate