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
Influenza is caused by 
Select and explain. 
A. Orthomyxo virus, which is a DNA virus, B. Paramyxo virus, which is a RNA Virus, C. Paramyxo virus, which is a DNA Virus, D. Orthomyxo virus, which is a RNA virus
D: Orthomyxo virus, which is a RNA virus
Answer: D: Orthomyxo virus, which is a RNA virus 
Explanation: None