This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
The following sign is seen in which of the following anomaly? 
Select and explain. 
A. Esophageal atresia, B. Tracheoesophageal fistula, C. Duodenal atresia, D. Large bowel obstruction
C: Duodenal atresia
Answer: C: Duodenal atresia 
Explanation: Duodenal atresia occurs in approximately 1 in 10,000 bihs. It is characterized by the sonographic double-bubble sign, which represents distention of the stomach and the first pa of the duodenum. as seen on this axial abdominal image. Demonstrating continuity between the stomach and proximal duodenum confirms that the second "bubble" is the proximal duodenum(Ref: William's Obstetrics; 25th edition)