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
Which of the following is a RNA virus? 
Select and explain. 
A. Measles virus, B. Herpes virus, C. Papaya virus, D. Adeno virus
A: Measles virus
Answer: A: Measles virus 
Explanation: None