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: Unknown
[{'content': 'A neonate with Down syndrome is having bilious vomiting \nSelect and explain. \nA. Duodenal atresia, B. Congenital hypertrophic pyloric stenosis, C. Ileal atresia, D. Anorectal malformation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Duodenal atresia Ref - The image shows the presence of double bubble appearance suggestive of diagnosis of duodenal atresia. About 8% of children with Down syndrome are born with duodenal atresia which presents with bilious vomiting.', 'role': 'assistant'}]