Active immunity may be acquired by

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(D) Active immunity is developed when a host is exposed to antigens,which may be in the form of living or dead microbes,proteins,or toxins.Upon exposu

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All of these

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(D) Active immunity is developed when a host is exposed to antigens,which may be in the form of living or dead microbes,proteins,or toxins.Upon exposure,the host's immune system recognizes these antigens and produces specific antibodies within the body.Natural infection leads to the natural development of active immunity.Vaccines and toxoids are biological preparations that introduce antigens into the body to stimulate an active immune response without causing the disease.Therefore,all the mentioned options are methods through which an antigen enters the host body to induce active immunity.

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Assertion $(A)$: Antigen can be easily recognized because it has antigenic determinants.
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