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
The commonest bladder stone is 
Select and explain. 
A. Triple phosphate, B. Xanthine, C. Uric acid, D. Cysteine
C: Uric acid
Answer: C: Uric acid 
Explanation: IInd MC vesical calculi → Sturvite stones