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 in seen in – \nSelect and explain. \nA. Duodenal atresia, B. Jejunal atresia, C. Pyloric stenosis, D. Hirschprung disease', 'role': 'user'}, {'content': "Answer: A \nExplanation: Double bubble sign is seen in duodenal atresia, duodenal web, duodenal stenosis, Ladd's band, Annular pancreas, Malrotation of the gut, preduodenal vein.", 'role': 'assistant'}]