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: Radiology
[{'content': 'Mercedes Benz sign is seen in \nSelect and explain. \nA. Pneumoperitoneum, B. Ileocecal TB, C. Gall stones, D. Acute pancreatitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Seagull or mercedes Benz or crow feet sign - Gall stones.', 'role': 'assistant'}]