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: Medicine
Which is not a macrophage: 
Select and explain. 
A. Monocyte, B. Microgila, C. Kupffer cells, D. Lymphocytes
D: Lymphocytes
Answer: D: Lymphocytes 
Explanation: Answer is D (Lymphocytes):