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
Gall stones - 
Select and explain. 
A. Are about twice as common in men as in women, B. There is an increased incidence of stones in diabetics, C. About 80-90% of gall stones are radio-opaque, D. Are usually more than 50 mm in diameter
B: There is an increased incidence of stones in diabetics
Answer: B: There is an increased incidence of stones in diabetics 
Explanation: Ans. is 'b' i.e. There is an increased incidence of stones in diabetics