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: Pathology
Phagocytosis is not done by - 
Select and explain. 
A. NK cells, B. Histiocytes, C. WBC, D. Macrophages
A: NK cells
Answer: A: NK cells 
Explanation: Ans. is 'a' i.e., NK cells