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 in seen in – 
Select and explain. 
A. Duodenal atresia, B. Jejunal atresia, C. Pyloric stenosis, D. Hirschprung disease
A: Duodenal atresia
Answer: A: Duodenal atresia 
Explanation: Double bubble sign is seen in duodenal atresia, duodenal web, duodenal stenosis, Ladd's band, Annular pancreas, Malrotation of the gut, preduodenal vein.