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A vaccine works by stimulating
Apassive immunity via ready-made antibodies (typical)
Binnate barriers like skin
Cnatural killer cells
Dactive acquired immunity through formation of memory cells
Answer & Solution
Correct answer: D. active acquired immunity through formation of memory cells
1. A vaccine introduces a weakened or inactivated antigen.
2. The immune system mounts a primary response, generating antibodies AND memory B and T cells.
3. Subsequent exposure triggers a faster, stronger secondary response; this is active acquired immunity.
_Source: Maharashtra Balbharati Std XII Biology, Ch 9 "Human Health and Diseases" §9.4_
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