This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Gasless abdomen in xRay is a sign of \nSelect and explain. \nA. Acute pancreatitis, B. Necrotizing enterocolitis, C. Ulcerative colitis, D. Intussusception', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radiological appearance of Acute pancreatitis Renal halo sign Gasless abdomen. Ground glass appearance Colon cut off sign Sentinel loop Ref: Sabiston 20th edition Pgno : 1527', 'role': 'assistant'}]