This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'CD4 count refers to \nSelect and explain. \nA. T helper cells, B. B cells, C. Cytotoxic cells, D. Both B And T Cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Helper T-cells → CD4 positive. o Cytotoxic T-cells and suppressor T-cells → CD 8 positive,\nBased on function CD4 helper T cells are divided into1. Effector CP4 helper T-cells\n\nFunctions are- A.\nBy TH1 cells\ni. Activate macrophages\nii. Delayed hypersensitivity\niii. Cell-mediated immunity\niv. The killing of intracellular microbes. e.g. tuberculosis and leprosy\nv. Destruction of target cells by.\nActivate CDS T cells to become cytotoxic cells. b. Activate NK cells B By TH2 celts\ni) Activate B cells to develop into anybody producing plasma cells → facilitate the synthesis of antibodies.\n2. Memory CD4 helper T cells □ Retain the antigenic affinity of the originally activated T cells and are used to act as later effector cells during a second immune response.', 'role': 'assistant'}]