alleryVaccination works by producing
AInnate immunity
BActive immunity through memory B and T cells
CNon-specific defence
DPassive immunity via injected antibodies
Answer & Solution
Correct answer: B. Active immunity through memory B and T cells
1. Vaccines contain antigens (weakened pathogens, killed pathogens or protein fragments).
2. Exposure primes the immune system, generating memory B and T cells.
3. On re-exposure, memory cells produce a fast, strong secondary response.
4. This constitutes ACTIVE ACQUIRED immunity; passive immunity uses pre-formed antibodies.
_Source: syllabus Biology, Ch 7 "Human Health and Disease", §7.2_
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