Question

what type of t cell controls the activity of other leukocytes by producing cytokines?
a helper t cells
b cytotoxic t cells
c regulatory t cells
d killer t cells

Explanation:

Helper T cells secrete cytokines which regulate the activity of other leukocytes like B - cells and macrophages. Cytotoxic T cells (also called killer T cells) directly kill infected or cancerous cells. Regulatory T cells maintain immune tolerance.

Answer:

A. Helper T cells