Development of active immunity is related to

NK cells

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Helper T-cells

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Suppressor cells

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Memory cells

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Solution

The correct option is D Memory cells
Active immunity develops in a body on being exposed to a live pathogen. Here the pathogen establishes an infection, which is then subdued in time and the immunity is built due to the formation of memory cells.

Suggest Corrections

Column I	Column II
A. Helper T cells	1. Directly attack and kill a cell
B. Cytotoxic T cells	2. Prevent attacking own cell
C. Suppressor T cells	3. Prevent exaggerated immune response
D. T delayed hypersensitivity cells	4. Activation of B cells