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
The most frequent congenital anomaly of the GI tract is - 
Select and explain. 
A. Imperforate anus, B. Meckel's diveticulum, C. Malrotation, D. Duodenal atresia
B: Meckel's diveticulum
Answer: B: Meckel's diveticulum 
Explanation: None