Antibodies are produced by which type of cells?

• A. Plasma cells
• B. T cells
• C. Macrophages
• D. Neutrophils

Answer: (A)

Antibodies are produced by plasma cells, which come from B lymphocytes. When a B cell encounters its specific antigen and receives help from helper T cells, some B cells differentiate into plasma cells that act as antibody factories, secreting large amounts of antibodies into blood and tissues. These antibodies recognize and bind the target antigen, helping neutralize and mark it for destruction by other parts of the immune system. T cells drive and coordinate immune responses but do not produce antibodies. Macrophages and neutrophils are phagocytes that ingest pathogens and, in some cases, present antigens, but they do not synthesize antibodies.