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
Which of the following is not a type of microglia 
Select and explain. 
A. Oligodendrocyte, B. Schwann cells, C. Spirocytes, D. Astrocytes
C: Spirocytes
Answer: C: Spirocytes 
Explanation: There are three types of microglia: oligodendrocytes, Schwann cells, and astrocytes.