This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': "Rigler's sign is suggestive of - \nSelect and explain. \nA. Pneumothorax, B. Pneumoperitoneum, C. Peritonitis, D. Hemothorax", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pneumoperitoneum Rigler's Signo Both sides of bowel become visible because of free gas on an abdominal xray. This is known as Rigler's Sign.", 'role': 'assistant'}]