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: Pediatrics
[{'content': 'Double bubble sign in children seen in A/E – \nSelect and explain. \nA. Ladds band, B. Annular pancreas, C. Pancreatic pseudocyst, D. Diaphragmatic hernia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Obstruction of 2nd part of duodenum cause double bubble sign on plain abdominal radiograph. OIt may be due to -\n\ni)\xa0 Annular pancreas\nii) Pancreatic pseudocyst\niii) Ladds band\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\niv) Tumor in the head of the pancrease', 'role': 'assistant'}]