This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Anatomy
Liver is divided into eight segments according to Couinaud's classification based upon 
Select and explain. 
A. Bile Duct, B. Poal vein, C. Hepatic Vein, D. Hepatic aery
B: Poal vein
Answer: B: Poal vein 
Explanation: Segmental anatomy of liver. Liver is divided into 8 segments by DAV structures (bile duct, hepatic aery, poal vein) Poal vein is most impoant among them Left hepatic vein separates medial & lateral segments Right hepatic vein separates anterior & posterior segments Poal vein separates upper & lower segments From surgical perspective, right hepatectomy - involve division of liver in principle plane in which segment V, VI, VII, VIII would be removed leaving segments I, II, III, IV Hepatic vein is now removed from couinaud's classification