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: Gynaecology & Obstetrics
Placenta has : 
Select and explain. 
A. 1 aery + 2 veins, B. 2 aeries + 1 vein, C. 2 aeries + 2 veins, D. 3 aeries + 3 veins
B: 2 aeries + 1 vein
Answer: B: 2 aeries + 1 vein 
Explanation: 2 aeries + 1 vein