Identify the role of helper T-cell lymphocytes in regulating the activity of the immune system.
A. Helper T-cell lymphocytes are scavenger cells that engulf and digest infectious organisms and foreign substances.
B. The function of helper T-cells is to recognize the foreign antigens presented to them by macrophages and other antigen-presenting cells.
C. Helper T-cell lymphocytes function as antigen-presenting cells.
D. All of these are correct.
Answer: B
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