This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which of the following is not a phagocytic cell - 
Select and explain. 
A. Macrophages, B. Kupffler cells, C. NK cells, D. Neutrophils
C: NK cells
Answer: C: NK cells 
Explanation: Ans. is 'c' i.e., NK cells* Micro-organisms entering the tissue fluid or blood stream are very rapidly engulfed by the cells called phagocytes.* Phagocytic cells are of two types:1) Mononuclear macrophages: Monocytes (blood), histiocytes (tissues), alveolar macrophages (lung), kupffer cells (liver), microglia (brain), osteoclasts (bone), and mesangial cells (kidney).2) Polymorphonuclear microphages: Neutrophils.* Basophils also belong to polymorphonuclear microphages but they are not phagocytes.* Eosinophils have only a limited degree of phagocytic activity.