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': "Double bubble sign is seen in A/E \nSelect and explain. \nA. Lad's band, B. Annular pancreas, C. Pancreatic pseudocyst, D. Diaphragmatic hernia", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Diaphragmatic hernia', 'role': 'assistant'}]