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 seen in: 
Select and explain. 
A. Duodenal atresia, B. Ileal atresia, C. Pyloric stenosis, D. Pancreatic divisum
A: Duodenal atresia
Answer: A: Duodenal atresia 
Explanation: A i.e. Duodenal atresia