Which lymphocyte is responsible for inducing class switching in B cells?

• A. Regulatory T cells.
• B. Cytotoxic T cells.
• C. Helper T cells.
• D. Memory T cells.

Answer: (C)

Verified step by step guidance

1. Understand the role of different types of T cells in the immune response. Helper T cells (Th cells) are crucial for activating and directing other immune cells, including B cells.
2. Learn about the process of class switching in B cells. Class switching is a mechanism that changes a B cell's production of immunoglobulin (antibody) from one type to another, such as from IgM to IgG.
3. Recognize that Helper T cells, specifically Th2 cells, provide signals to B cells through cytokines and direct cell-to-cell contact, which are necessary for class switching.
4. Differentiate between the functions of various T cells: Regulatory T cells help maintain immune tolerance, Cytotoxic T cells kill infected cells, and Memory T cells provide long-term immunity.
5. Conclude that Helper T cells are responsible for inducing class switching in B cells by providing the necessary signals and support for this process.