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
[{'content': "Double bubble sign on X-Ray is seen in: \nSelect and explain. \nA. Duodenal atresia, B. Oesophageal atresia, C. Colonic atresia/Hirschprung's disease, D. Pyloric stenosis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Duodenal atresia', 'role': 'assistant'}]