This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
The function common to neutrophils, monocyte & macrophages is - 
Select and explain. 
A. Immune response, B. Phagocytosis, C. Liberation of histamine, D. Destruction of old erythrocytes
B: Phagocytosis
Answer: B: Phagocytosis 
Explanation: Phagocytes

Micro-organisms entering the tissue fluid or bloodstream are very rapidly engulfed by the cells called phagocytes.


Phagocytic cells are of two types :


Mononuclear macrophages: Monocytes (blood), histiocytes (tissues), alveolar macrophages (lung), kupffer cells (liver), microglia (brain), osteoclasts (bone), and mesangial cells (kidney).
Polymorphonuclear microphages: Neutrophils.


Basophils also belong to polymorphonuclear microphages but they are not phagocytes.
Eosinophils have only a limited degree of phagocytic activity.