This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, 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: Functional anatomy of the liver is based on couinaud's division of liver into eight (subsequently nine) functional segments, based upon the distribution of poal venous branches and location of hepatic veins in the parenchyma Couinaud 1957