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: Surgery
[{'content': "The most frequent congenital anomaly of the GI tract is - \nSelect and explain. \nA. Imperforate anus, B. Meckel's diveticulum, C. Malrotation, D. Duodenal atresia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]