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
Meckel's diveiculum is remnant of - 
Select and explain. 
A. Vitello intestinal duct, B. Urachus, C. Oganic diaphragm, D. None
A: Vitello intestinal duct
Answer: A: Vitello intestinal duct 
Explanation: Ans. is 'a' i.e., Vitello intestinal duct