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: Medicine
False about Influenza is 
Select and explain. 
A. H5N1 is cause of Avian influenza, B. Type A pandemics every 2-3 years, C. Incubation period is 18-72 hours, D. All the above
B: Type A pandemics every 2-3 years
Answer: B: Type A pandemics every 2-3 years 
Explanation: Type A pandemics every 10-15 years.