Final answer:
T cell activation leads to the production of B) cytokines, which play a crucial role in regulating the immune response.
Step-by-step explanation:
T cell activation leads to the production of cytokines. Cytokines are small proteins secreted by T cells that help regulate the immune response.
They play a crucial role in communication between immune cells and can promote inflammation, activate other immune cells, and stimulate the production of antibodies by B cells.