In the adaptive immune system, which cells are responsible for producing antibodies?

• A. B cells produce antibodies.
• B. T cells produce antibodies.
• C. Macrophages produce antibodies.
• D. Neurons produce antibodies.

Answer: (A)

Antibody production is carried out by B cells, which, after recognizing their specific antigen and receiving help from helper T cells, differentiate into plasma cells that secrete large quantities of antibodies. These antibodies circulate and bind to the antigen, neutralizing pathogens or tagging them for attack by other parts of the immune system. T cells are involved in cellular immunity and assistance but do not produce antibodies; macrophages ingest pathogens and present antigens but don’t secrete antibodies; neurons are not involved in the immune response.