Proliferation of T-cells in response to antigen presentation is accompanied by enlargement of __ a. lymph nodes b. Thymus c.size of antibody d. size of B -cell

The correct answer is a. lymph nodes.<br /><br />When T-cells proliferate in response to antigen presentation, it is accompanied by the enlargement of lymph nodes. Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. They play a crucial role in the immune response by filtering lymph fluid and trapping foreign particles, such as bacteria and viruses. When an antigen (a foreign substance) enters the body, it is detected by immune cells, including T-cells. The T-cells then become activated and start to divide and proliferate, leading to an increase in their numbers. This proliferation of T-cells triggers the lymph nodes to enlarge, allowing for a more effective immune response.