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: Pathology
Most common primary for metastatic colorectal cancer is ? 
Select and explain. 
A. Squeamous cell carcinoma of lung, B. Hepatocellular  cancer, C. Adenocarcinoma of lung, D. Renal cell cancer
B: Hepatocellular  cancer
Answer: B: Hepatocellular  cancer 
Explanation: Most comman primary for metastatic colorectal cancer is lives.