The three major types of lymphocyte are T cells, B cells and natural killer (NK) cells. Lymphocytes can be identified by their large nucleus. T helper cells(TH cells) assist other white blood cells in immunologic processes, including maturation of B cells into plasma cells and memory B cells and activation of cytotoxic T cells and macrophages These cells are also known as CD4+T cells because they express the CD4 glycoprotein on their surfaces. Helper T cells become activated when they are presented with peptide antigens by MHC class two molecules, which are expressed on the surface of antigen- presenting cells (APCs).
So, the correct option is 'Option D'.
Which of the following options is true regarding the B-cells?
B- cells are the bone marrow cells which are the major components of the immune response. B-cells are produced in the bone marrow, they migrate to the spleen and other secondary lymphoid tissues. B-cells are responsible for generating antibodies to different antigens.