This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder, Subject name: Surgery
Percentage of gallstones which are radiopaque: 
Select and explain. 
A. 10%, B. 20%, C. 30%, D. 40%
A: 10%
Answer: A: 10% 
Explanation: Most (90%) gallstones are radioluscent. Most (90%) kidney stones are radiopaque. Most gall stones are cholesterol stones (>90%) are radiolucent