This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallstone Disease, Subject name: Surgery
MERCEDES BENZ sign seen In - 
Select and explain. 
A. Volvulus, B. Gall stone, C. Struvite calculus, D. Intussuception
B: Gall stone
Answer: B: Gall stone 
Explanation: Ans. is 'b' i.e., Gall stoneRemmeber :o Mercedes benz sign (Also known as Jack stone sign)On xray - Gall stonesOn echocardiography - Cross section of aortic valve