This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': "Meckel's diverticulum is a derivative of: \nSelect and explain. \nA. Allantoic diverticulum, B. Vitellointestinal duct, C. Ventral mesogastrium, D. Ductus arteriosus", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Vitellointestinal duct* Persistence of Proximal VID: Meckel's* Persistence of Distal VID: Umbilical adenoma (Raspberry; tumor)", 'role': 'assistant'}]