Active immunity is generated by

Exposure to a live pathogen

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Exposure to a dead pathogen

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By transfer of antibodies from a healthy person

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Both A and C

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Solution

The correct option is B
Exposure to a dead pathogen

Active immunity could be developed in the body on being exposed to a live pathogen. Here the pathogen establishes an infection, which is then subdued in time and immunity is built due to the formation of memory cells. Exposure to a dead pathogen as in the case of vaccines, wherein dead and weakened pathogens are administered, also induces active immunity.

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