This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
Double bubble sign is seen in - 
Select and explain. 
A. Ladd's band, B. Annular pancreas, C. Duodenal atresia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the above o Double bubble sign is seen in duodenal atresia, duodenal web, deudenal stenosis, Ladd's band, Annular pancreas, Malrotation of gut, preduodenal vein.Single Bubble signCongenita] hypertrophic pyloric stenosisDouble Bubble signDuodenal atresiaDuodenal webDuodena] stenosisLadd's bandAnnular pancreasMalrotation of gutPreduodenal veinTriple Bubble signJejunal or proximal ileum atresiaMultiple Bubble signIleal atresia