What is the primary function of CD4+ T cells in the context of blood components?

A To produce antibodies against pathogens
B To activate B cells and facilitate antibody production
C To directly kill infected cells or produce chemical signals that activate other immune responses ✓
D To filter old or damaged red blood cells from the circulation

Explanation

CD4+ T cells, also known as T helper cells, play a crucial role in the immune system by activating B cells and other immune responses, but they do not directly kill infected cells or filter blood components.

Source

Robbins and Cotran Pathologic Basis of Disease
Hematology Hematology: Blood Components Hematology: Blood Components Medium MEDICAL Confidence: high