This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal circulation, Subject name: Pediatrics
Umbilical cord has: 
Select and explain. 
A. 1 vein and 2 aeries, B. 2 vein and 2 aeries, C. 1 vein and 1 aery, D. 2 veins and 1 aery
A: 1 vein and 2 aeries
Answer: A: 1 vein and 2 aeries 
Explanation: CONTENTS OF UMBILICAL CORD: - 2 Umbilical aeries - 1 Umbilical vein - Rudimentary allantois - Remnant of omphalomesenteric / vitellointestinal duct - Whaon's jelly