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: Pediatrics
Arrange the following in the sequence of closure : 
Select and explain. 
A. Umbilical Aery, B. Umbilical Vein, C. Ductus venosus and Foramen ovale, D. All
D: All
Answer: D: All 
Explanation: Ans. D. All