This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Social & Preventive Medicine
Recent influenza pandemic was due to which strain? 
Select and explain. 
A. H1N1, B. H5N1, C. H7N7, D. H3N2
A: H1N1
Answer: A: H1N1 
Explanation: Influenza us cause by Ohomyxovirus 3 types: A, B, C - Type A:MC cause of outbreaks/ epidemics; only cause of pandemics Examples: H1 N1 (Type A) - Cause of Swine flu -Recent influenza pandemic H2 N2 (Type A) H5 N1 (Type A) -Cause of An influenza (Bird flu)