This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta, Fetal Membranes, Birth Defects, and Twinning, Subject name: Anatomy
Content of umbilical cord: 
Select and explain. 
A. 2 artery, 1 vein, B. 2 veins, 1 artery, C. 2 artery,2 veins, D. 1 artery, 1 vein
A: 2 artery, 1 vein
Answer: A: 2 artery, 1 vein 
Explanation: Ans. (a) 2 artery, 1 veinRef: LB. Singh 9th ed. 159"Remember 2AV"* Umbilical cord is the structure which connects mother to fetus and acts as a bridge for transfer of blood and other nutrients from mother to baby.* It contains 2 arteries and one vein. Arteries carry deoxygenated blood from fetus to mother while vein carry oxygenated blood from mother to fetus.* Cord contains whartons jelly and structures embedded in this are:# 2 arteries and 1 vein# Allantois and# remains of vitellointestinal duct