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 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: Duodenal atresia