Which cell secretes antibody?

Correct option is B

Sol. Lymphocytes, specifically B-lymphocytes (B-cells), are responsible for secreting antibodies (immunoglobulins). When B-cells encounter an antigen, they differentiate into plasma cells, which produce large quantities of antibodies specific to that antigen. These antibodies play a critical role in the immune system by neutralizing pathogens and marking them for destruction. B-cells are part of the adaptive immune system and ensure immunological memory upon future exposure.
Explanation of each option:
· (a) Monocytes – Incorrect. Monocytes are phagocytic cells that differentiate into macrophages and dendritic cells but do not produce antibodies. They are part of innate immunity.
· (b) Lymphocytes – Correct. B-lymphocytes secrete antibodies after differentiating into plasma cells. These antibodies target specific antigens and aid in long-term immunity.
· (c) Neutrophils – Incorrect. Neutrophils are white blood cells that engulf pathogens via phagocytosis but do not produce antibodies. They are first-line defenders in innate immunity.
· (d) Eosinophils – Incorrect. Eosinophils combat parasites and are involved in allergic reactions. They release enzymes and toxic proteins but not antibodies.