Question

multiple choice question
type iv hypersensitivities primarily involve ______ cells.

• t
• b
• nk
• phagocytic
• mast

Explanation:

Type IV hypersensitivity (delayed - type hypersensitivity) is a cell - mediated immune response. T cells, specifically CD4⁺ T helper cells and CD8⁺ cytotoxic T cells, play the primary role in this type of hypersensitivity. B cells are mainly involved in humoral immunity (antibody - mediated responses), NK cells are part of the innate immune system and have a role in killing virus - infected cells and tumor cells, phagocytic cells are involved in phagocytosis and innate immunity, and mast cells are involved in type I hypersensitivity (immediate hypersensitivity) by releasing mediators like histamine. So, Type IV hypersensitivities primarily involve T cells.

Answer:

A. T (assuming the first option with the selected radio button is option A, and the text is "T")