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: Medicine
Most common cause of malignant poal vein thrombosis is: 
Select and explain. 
A. Renal cell carcinoma, B. Carcinoma prostate, C. Hepatocellular carcinoma, D. Carcinoma colon
C: Hepatocellular carcinoma
Answer: C: Hepatocellular carcinoma 
Explanation: Malignancies are responsible for 21%-24% of overall cases of PVT. Among them hepatoma accounts for majority followed by pancreatic malignancy. PVT is common in patients affected by liver cirrhosis. Ref: World J Gastroenterol 2010 January 14; 16(2): 143-155.