Which of the following cells are mainly infected by HIV?

Explanation

Option B is correct.A)T-killer lymphocytes, also known as cytotoxic T-cells, are a type of T-cell that is responsible for killing infected cells. They are a part of the adaptive immune system and play a role in cell-mediated immunity. T-killer lymphocytes are derived from T-cells that mature in the thymus gland. In the thymus, T-cells are exposed to a variety of antigens, which helps them to develop the ability to recognize and respond to specific invaders. HIV attacks on helper T-lymphocytes so this option is incorrect.B)Helper T-lymphocytes, also known as CD4+ T-cells, are a type of T-cell that helps other immune cells to fight infection. They are a part of the adaptive immune system and play a role in cell-mediated immunity. Helper T-lymphocytes are derived from T-cells that mature in the thymus gland. In the thymus, T-cells are exposed to a variety of antigens, which helps them to develop the ability to recognize and respond to specific invaders. This is the correct answer.C)B-plasma cells are mature B-cells that produce antibodies. They are found in the bone marrow and lymph nodes. B-plasma cells are responsible for the humoral immune response, which is the part of the immune system that fights infection using antibodies. HIV attacks on helper T-lymphocytes so this option is incorrect.D)B-memory cells are a type of B-cell that is produced during the primary immune response. They are long-lived cells that can survive for many years. B-memory cells are important for the secondary immune response, which is the faster and more robust immune response that occurs when a person is exposed to an antigen that they have been exposed to before.HIV attacks on helper T-lymphocytes so this option is incorrect.