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
[{'content': 'MERCEDES BENZ sign seen in \nSelect and explain. \nA. Volvulus, B. Gall stone, C. Struvite calculus, D. Intussuception', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Gall stoneMercedes benz sign (Also known as fack stone sign)On xray - Gall stones', 'role': 'assistant'}]