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
Stone which is resistant to lithiotripsy 
Select and explain. 
A. Calcium oxalate, B. Triple phosphate stone, C. Cystine stone, D. Uric acid stone
C: Cystine stone
Answer: C: Cystine stone 
Explanation: lithiotripsy  is a medical procedure involving the physical destruction of hardened masses like kidney stones.