This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Anatomy
Macrophage of Central Nervous System includes 
Select and explain. 
A. Astrocytes, B. Microglia, C. Neuron', D. Oligodendrocyte
B: Microglia
Answer: B: Microglia 
Explanation: (B) Microglia # Microglia are tissue macrophages that populate the mammalian central nervous system (CNS) very early in embryonic development. By adulthood, microglia are found in all regions of the brain and spinal cord and comprise 10-15% of the total cells in the CNS.