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
Percentage of renal stones which are radio opaque: 
Select and explain. 
A. 10%, B. 25, C. 75%, D. 90%
D: 90%
Answer: D: 90% 
Explanation: 90% Of renal stones are radio opaque
90% of gall stones are radiolucent.