Answer:
Memory T-cells—mediate apoptosis
Step-by-step explanation:
T-lymphocytes on maturation form many types of T cells like a cytotoxic cell, helper T cell, regulatory T cell, memory T cell and others.
The cytotoxic T cells and helper T cells are the major T cells which play important role in eliminating the pathogen as the Helper T cell produces cytokines which stimulate other immune cells and Cytotoxic cells kill the virus intracellular antigens or virus-infected cells.
The Plasma cells secrete antibodies which interact with an antigen and eliminate the pathogen but the memory T cells formed after the interaction with antigen does not mediate apoptosis but they provide a rapid immune response to the infection that has affected in the past by proliferating themselves into effector cells.
Thus, Memory T-cells—mediate apoptosis is the correct answer.