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Vaccines are effective in preventing disease because they

Aprepare the immune system to recognize and destroy pathogens.
Bcombine with pathogens to inactivate them.
Ccontain specific B lymphocytes.
Dconsist of bacteria that could infect healthy cells

Verified Answer :

The answer is  a. Because think of the flu for example. The  flu vaccine is designed to recognize flu pathogens, then from time time if you have the flu, You body will recognize the pathoges and fight the flu. Some people even become immune to the flu.

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