CD 4 are associated with -: (A) Helper T cell, (B) Supressor T cell, (C) NK cells, (D) T cell antigen receptor complex
Answer is A. T cells can differentiate into effector cells. Helper (CD4) T-cell activity, in addition to stimulating B cells to produce antibodies, promotes the development of delayed hypersensitivity and thereby also serves in the defense against intracellular agents, including intracellular bacteria (eg, mycobacteria), fungi, protozoa, and viruses. Reff: Ananthanarayanan & Panikers textbook of microbiology 9th edition pg: 135