38. What is cell mediated immunity? (A) presence of antigen cause B cell to proliferation and differentiate into plasma cells and memory B cells. (B) effector T cells are needed to eliminate intracellular pathogens (within intracellular vesicles of cells following phagocytosis (CD4) or in the cytoplasm of infected cells (CD8) (C)occurs during thymic education, T cells that react with antigens present before birth are deleted to eliminating self-reactivity. (D) heterodimer produced by macrophages and dendritic cells. Major cytokine to induce differentiation. of CD4+ T cells into TH1 cells. (E)All of the above.