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: Medicine
[{'content': 'The most common congenital esophageal anomaly is which of the following? \nSelect and explain. \nA. Esophageal atresia, B. Esophageal psuedodiveiculum, C. Congenetal web, D. Schatzki ring', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most common congenital esophageal anomaly is esophageal atresia, occurring in about 1 in 5,000 live bihs. Reference: Harrisons Principles of Internal Medicine, 18th Edition', 'role': 'assistant'}]