What is the primary function of T lymphocytes in the immune response?

The primary function of T lymphocytes, or T cells, in the immune response is to attack infected or cancerous cells. T cells play a crucial role in cell-mediated immunity, where they directly interact with and destroy cells that are infected by pathogens, such as viruses, or that have become malignant. This process is vital for the elimination of pathogens that are not effectively targeted by antibodies and for the immune surveillance against tumor cells.

T cells can be categorized into different types, including cytotoxic T cells, which are specifically designed to destroy infected cells, and helper T cells, which assist in regulating the immune response by signaling other immune cells. This hierarchical structure of T cell function underscores their importance in providing a tailored and effective response to a variety of threats, ensuring the body can combat infections and malignancies effectively.

In contrast, other immune functions described in the incorrect options reflect different mechanisms or types of immune responses. For example, producing antibodies is primarily the role of B lymphocytes, while phagocytosis of bacteria is chiefly carried out by macrophages and neutrophils. The complement system is a part of the innate immune response that works alongside antibodies, but it is not the primary function of T cells. Therefore, option B encapsulates the critical role