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
[{'content': 'Tumour marker for a highly vascular tumour \nSelect and explain. \nA. Desmin, B. Keratin, C. Sa 200, D. Alpha-feto protein', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Keratin o Mesotheloma is highly vascular and keratin is a marker of mesotheloma.", 'role': 'assistant'}]