Concept: Immunity classification based on source (natural vs. artificial) and mechanism (active vs. passive).
Solution: When a pathogen naturally infects a host, the host's own immune system responds by producing specific antibodies and memory B/T cells. Because the stimulus was a natural illness and the immune system actively generated its own response, this is classified as
naturally induced active immunity.
Why other options are incorrect:- Option A: Active immunity is correct in general, but it lacks the necessary specificity regarding the natural mode of acquisition.
- Option C: Artificially induced active immunity involves deliberate exposure to antigens via vaccines, not natural disease acquisition.
- Option D: Passive immunity involves receiving pre-formed antibodies from an outside source without mounting an active immune response.
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