This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Most common oncogenic RNA virus - 
Select and explain. 
A. Retrovirus, B. Picornavirus, C. Ohomyxovirus, D. Paramyxovirus
A: Retrovirus
Answer: A: Retrovirus 
Explanation: only oncogenic RNA viruses retetro viruses REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.565