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
Causative agent of influenza? 
Select and explain. 
A. H influenzae, B. Ohomyxovirus, C. Paramyxovirus, D. Coronavirus
B: Ohomyxovirus
Answer: B: Ohomyxovirus 
Explanation: Ans. is 'b' i.e., Ohomyxovirus