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': 'Gasless abdomen in X-ray is a sign of - \nSelect and explain. \nA. Acute pancreatitis, B. Necoising enterocolitis, C. Ulcerative colitis, D. Intussusception', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Acute pancreatitis Due to excessive vomiting", 'role': 'assistant'}]