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: Pediatrics
[{'content': 'Absent stomach bubble on antenatal ultrasonography is an important finding for antenatal diagnosis of – \nSelect and explain. \nA. Congenital heart disease in the foetus, B. Oesophageal atresia in the foetus, C. Omphalocele in the foetus, D. Spina bifida in the foetus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]