A dendritic cell presents an antigen to a T helper cell. What is the expected outcome of this interaction?

• A. Apoptosis of the T helper cell.
• B. Activation of the T helper cell, leading to cytokine secretion and further immune activation.
• C. Differentiation of the T helper cell into a cytotoxic T cell.
• D. Inhibition of the T helper cell, preventing immune response.

Answer: (B)