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: Physiology
Histiocytes are: 
Select and explain. 
A. Scavenger cells, B. Allergic cells, C. Released in immunologic response, D. Leukocytes
A: Scavenger cells
Answer: A: Scavenger cells 
Explanation: None