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
Regarding stones in gall bladder the following are true except - 
Select and explain. 
A. Mixed stones are common in the west, B. In Saints Triad diverticulosis of colon and hiatus hernia coexist, C. Is a risk factor in the development of GB carcinoma, D. 90% of GB stones are radioopaque
D: 90% of GB stones are radioopaque
Answer: D: 90% of GB stones are radioopaque 
Explanation: None