Of the options given, the one that recognizes antigens displayed on host cells with MHC II is: "TH cell" (Option C)
Helper T-cells are an immune cell type. They are one of the primary cell types generated by your thymus. When there is an infection in your body, helper T-cells detect it. To combat the infection, they stimulate additional immune cells. T-cells play a vital role in your adaptive immune response.
Th/Tc cell activation occurs when an antigen (foreign body) is phagocytosed by an antigen-presenting cell (APC). The antigen is displayed on MHCII and recognized by the TCR on the Th cell. The combination of B7 and B28 produces a "costimulatory signal."
T cells are stimulated on the surface of antigen-presenting cells, which develop as a result of infection-induced innate immune responses. Innate responses also affect what type of effector cell a helper T cell develops into, and hence the form of the adaptive immune response induced.
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