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: Anatomy
The Couinaud's segmental nomenclature is based on the position of the : 
Select and explain. 
A. Hepatic veins and poal vein, B. Hepatic veins and biliary ducts, C. Poal vein and biliary ducts, D. Poal vein and hepatic aery
A: Hepatic veins and poal vein
Answer: A: Hepatic veins and poal vein 
Explanation: A i.e. Hepatic vein & poal vein