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(B) The immune system consists of various types of lymphocytes that perform specific functions.$T$-lymphocytes (or $T$-cells) are responsible for cell

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Killer $T$-cells

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(B) The immune system consists of various types of lymphocytes that perform specific functions.$T$-lymphocytes (or $T$-cells) are responsible for cell-mediated immunity.Among these,Killer $T$-cells (also known as Cytotoxic $T$-cells) are specialized cells that directly recognize,attack,and destroy infected host cells or foreign antigens.Helper $T$-cells,on the other hand,primarily function by secreting cytokines to activate other immune cells like $B$-cells and macrophages,rather than directly destroying antigens themselves.$B$-cells are primarily involved in humoral immunity by producing antibodies.

The cells which directly attack and destroy the antigens are known as

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