A flu shot will be effective if is well matched, meaning the immunization matches that year's influenza viruses. If a flu shot is well matched, it will give the body
A. additional helper T cells within the organs of the body.
B. the ability to use a pathogen to stimulate antigens.
C. the ability to remember an encounter with a specific organism.
D. the ability to tell a harmful pathogen from a harmless one.
Answer: C
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