Question

The principle of vaccination is based on which property of the immune system?

• A. Plasticity
• B. Specificity
• C. Diversity
• D. Memory

Hint:

Immune memory is the cornerstone of vaccine efficacy.

Answer 1

The Correct Option is D

The principle of vaccination is based on the immune system's property of Memory.

(A) Memory - Correct: Vaccines stimulate immunological memory via memory B-cells and T-cells.

(B) Specificity - Incorrect: While important, this isn't the basis of vaccination.

(C) Diversity - Incorrect: Refers to antigen receptor variety, not vaccine mechanism.

(D) Plasticity - Incorrect: Describes immune adaptability, not vaccine function.

The correct answer is (D) Memory, enabling rapid response upon pathogen re-exposure.

Answer 2

The principle of vaccination is based on the immune system’s ability to remember previous encounters with pathogens. When a person is vaccinated, they are exposed to a harmless form of a pathogen (e.g., killed bacteria or attenuated viruses). This triggers the immune system to produce antibodies and memory cells.

These memory cells allow the immune system to mount a rapid and effective response if the body encounters the real pathogen in the future.

Option (A) is correct because vaccination relies on the immune system's memory.