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 abdominal X-ray is seen in : 
Select and explain. 
A. Colon carcinoma, B. Duodenal atresia, C. Acute pancreatitis, D. Perforation
B: Duodenal atresia
Answer: B: Duodenal atresia 
Explanation: Double bubble sign is the characteristic abdominal Xray sign associated with duodenal atresia. In this, the stomach and first pa of the duodenum are the only pas of the intestine filled with gas giving the characteristic appearance. Duodenal atresia typically presents in the first hour of life. Children presents with bilious vomiting and epigastric distention within a few hours of bih. Meconium may be passed normally. It is often associated with other conditions such as esophageal atresia, intestinal atresia, cardiac and renal anomalies. Ref: Oski's Pediatric Ceification and Receification Board Review By Carmen Coombs, page 404. Sundaram S.S., Hoffenberg E.J., Kramer R.E., Sondheimer J.M., Furuta G.T. (2012). Chapter 21. Gastrointestinal Tract. In W.W. Hay, Jr., M.J. Levin, R.R. Deterding, J.J. Ross, J.M. Sondheimer (Eds), CURRENT Diagnosis & Treatment: Pediatrics, 21e.