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': 'Gasless abdomen is a feature of – \nSelect and explain. \nA. High obstruction, B. Acute pancreatitis, C. Congenital diaphragmatic hernia, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: High obstruction, acute pancreatitis and congenital diaphragmatic hernia can cause gasless abdomen.', 'role': 'assistant'}]