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
A newborn baby was brought with the history multiple episodes of bilious projectile vomiting. X-ray abdomen was done. What is the diagnosis? 
Select and explain. 
A. Duodenal atresia, B. Jejunal atresia, C. Ileal atresia, D. Hyperophic pyloric stenosis
B: Jejunal atresia
Answer: B: Jejunal atresia 
Explanation: Single bubble appearance: Hyperophic pyloric stenosis Double bubble appearance: Duodenal atresia & annular pancreas Triple bubble appearance: Jejunal atresia