T-cells are responsible for which type of immunity?

T-cells play a crucial role in cell-mediated immunity, which is a type of adaptive immune response. This form of immunity involves the activation and proliferation of T-cells in response to a specific pathogen or infected cell. T-cells can directly destroy infected cells or help activate other immune cells, such as B-cells, to produce antibodies.

Unlike humoral immunity, which primarily involves B-cells and the production of antibodies to target extracellular pathogens, cell-mediated immunity is essential for dealing with intracellular pathogens, such as viruses and some bacteria, as well as cancer cells. The specificity of T-cells insures that the immune response is targeted and effective against specific antigens.

In summary, the correct choice emphasizes the critical function of T-cells in orchestrating and executing cellular immune responses, distinguishing it clearly from other types of immunity.