This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Surgery
Which of the following liver tumor has a propensity to invade the poal or hepatic vein? 
Select and explain. 
A. Cavernous hemangioma, B. Hepatocellular carcinoma, C. Focal nodular hyperplasia, D. Hepatic adenoma
B: Hepatocellular carcinoma
Answer: B: Hepatocellular carcinoma 
Explanation: Hepatocellular carcinoma Characteristic of HCC; Propensity to invade the poal vein Causing "Multicentric & Bi-lobar" spread (in 75%-80%) . This happens because POAL VEINS are valveless .