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
Double bubble sign on X-Ray is seen in: 
Select and explain. 
A. Duodenal atresia, B. Oesophageal atresia, C. Colonic atresia/Hirschprung's disease, D. Pyloric stenosis
A: Duodenal atresia
Answer: A: Duodenal atresia 
Explanation: A i.e. Duodenal atresia