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: Surgery
Which one of the following is frequent cause of serum alpha feto protein level greater than 10 times the normal upper limit - 
Select and explain. 
A. Seminoma, B. Metastaic carcinoma of liver, C. Cirrhosis of liver, D. Oat cell tumour of lung
B: Metastaic carcinoma of liver
Answer: B: Metastaic carcinoma of liver 
Explanation: Ans. is 'b' i.e., Metastaic carcinoma of liver