This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large intestine, Subject name: Surgery
[{'content': 'A newborn baby was brought with the history multiple episodes of bilious projectile vomiting. X-ray abdomen was done. What is the diagnosis? \nSelect and explain. \nA. Duodenal atresia, B. Jejunal atresia, C. Ileal atresia, D. Hyperophic pyloric stenosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Single bubble appearance: Hyperophic pyloric stenosis Double bubble appearance: Duodenal atresia & annular pancreas Triple bubble appearance: Jejunal atresia', 'role': 'assistant'}]