Final answer:
The mismatched statement in the provided options is 'CD4 TH2 cell: cytotoxicity' since CD4 TH2 cells are associated with B cell activation and antibody production, not cytotoxicity, which is a function of CD8 T cells.
Step-by-step explanation:
The question which of the following is mismatched? has multiple options, but the incorrect match is CD4 TH2 cell: cytotoxicity. Cytotoxicity is the quality of being toxic to cells and in the context of immune cells, it refers to the ability to kill infected cells. CD8 T cells are known as cytotoxic T cells because they have this capability. CD4 TH1 cells are involved in macrophage activation, while CD4 TH2 cells are associated with B cell activation and the promotion of antibody (Ab) production. Therefore, claiming that CD4 TH2 cells are responsible for cytotoxicity is the mismatched statement in the options provided.