The most common flu vaccine is called a trivalent vaccine, because it contains
A. three different strains of inactivated viruses: A/Michigan/45/2015 (H1N1)pdm09-like virus, A/Hong Kong/4801/2014 (H3N3)-like virus, and B/Brisbane/60/2008-like (B/Victoria lineage) virus.
B. four different strains of live viruses: A/Michigan/45/2015 (H1N1)pdm09-like virus, A/Hong Kong/4801/2014 (H3N3)-like virus, and B/Brisbane/60/2008-like (B/Victoria lineage) virus, and B/Phuket/3073/2013 (Yamagata lineage) virus.
C. two different strains of inactivated viruses: A/Michigan/45/2015 (H1N1)pdm09-like virus and A/Hong Kong/4801/2014 (H3N3)-like virus.
D. three different strains of live viruses: A/Michigan/45/2015 (H1N1)pdm09-like virus, A/Hong Kong/4801/2014 (H3N3)-like virus, and B/Brisbane/60/2008-like (B/Victoria lineage) virus.
Answer: A
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