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
[{'content': 'Mercedes Benz sign is seen in- \nSelect and explain. \nA. Renal stone, B. Calcifiedlymphnode, C. Gall stone, D. Calcified fibroid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Gall stone "The mercedes benz sign describes a star shaped pattern of gas fissuring with in gall stones described on an abdominal radiograph', 'role': 'assistant'}]