Question

Which cells are responsible for producing antibodies in a human body ?

• A. Macrophages
• B. Helper T-Lymphocytes
• C. Cytotoxic T-Cells
• D. B-Lymphocytes

Hint:

B-lymphocytes turn into plasma cells that secrete antibodies.

Answer 1

The Correct Option is D

Step 1: Recall the two arms of immunity:
Humoral immunity depends on antibodies in body fluids. Cell-mediated immunity depends on T cells.
Antibody production belongs to the humoral arm.

Step 2: Identify the cell:
B-lymphocytes, on meeting an antigen, divide and form plasma cells and memory cells.
Plasma cells release large amounts of antibodies. So B-lymphocytes are the antibody producers.

Step 3: Why the others are wrong:
Macrophages engulf antigens and present them. They do not make antibodies.
Helper T cells help B cells to make antibodies by releasing signals, but they do not make antibodies themselves.
Cytotoxic T cells kill infected or foreign cells directly.

Final Answer:
B-lymphocytes produce antibodies. This is option (D).