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: Microbiology
Most common virus causing tumor in human ? 
Select and explain. 
A. HSV, B. HPV, C. EBV, D. HTLV
B: HPV
Answer: B: HPV 
Explanation: Ans. is 'b' i.e., HPV Was are the most common tumor caused by viruses.HPV is the cause of was.