The substances that are used to build immunity against certain diseases are called _________.
A
Vaccine
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B
Antidote
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C
Analgesic
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D
Antidepressants
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Solution
The correct option is A
Vaccine
Vaccines contain weak or killed pathogens which are injected into the body to build immunity against certain diseases. If we are vaccinated against any disease, we develop immunity against it and the chances of us getting that disease is very less.