This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
A child with bilious vomit and double bubble sign, and mother have polyhydramnios. Diagnosis is 
Select and explain. 
A. Duodenal atresia, B. HPS, C. Algile syndrome, D. Esophageal atresia
A: Duodenal atresia
Answer: A: Duodenal atresia 
Explanation: Due to complete stenosis of the 2 and pa of the duodenum at the level ampulla of Vater produces bilious vomiting, 50% associated with maternal polyhydramnios, a plain x-ray reveals 2 foci of gases one in the stomach and other in the duodenum-double bubble sign. Reference SRB edition :5 page :1195,924