Vaccines are stimulating substances that confer immunity to a disease. A vaccine is designed to improve immunity by introducing antigen. Thus, option C is correct.
Vaccines are substances that enhance the immune system of the body by deliberately introducing foreign proteins called antigens that cause diseases and infections.
The vaccine contains the dead or weakened microorganism to act as a toxin to illicit immune reactions. This leads to the formation of the immune cells along with the memory cells.
The memory cells remember the encounter with the antigen and are helpful in providing immunity when the same antigen attacks the body.
Therefore, option C. the vaccines introduce the immune system with an antigen.
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