<prompt> Helper T-cells are primarily involved in ?Cell mediated immunityKilling virus infected cellsKilling tumor cellsInvolved in type II hypersensitivity  <response>: Ans. is a i.e., Cell mediated immunity The main types of B cells are plasma cells, plasmablasts, memory B cells, and regulatory B cells. T cells are involved in cell-mediated immunity, whereas B cells are primarily responsible for humoral antibody -related immunity. 