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
Tumour marker for a highly vascular tumour 
Select and explain. 
A. Desmin, B. Keratin, C. Sa 200, D. Alpha-feto protein
B: Keratin
Answer: B: Keratin 
Explanation: Ans. is 'b' i.e., Keratin o Mesotheloma is highly vascular and keratin is a marker of mesotheloma.