This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
All of the following statements about neural cells are true except 
Select and explain. 
A. The human CNS contains about (10)11 neurons, B. Ependymal cells are involved in phagocytic functions, C. Both, D. None
B: Ependymal cells are involved in phagocytic functions
Answer: B: Ependymal cells are involved in phagocytic functions 
Explanation: Lining the CSF-filled ventricles, the ependymal cells play an impoant role in the production and regulation of CSF. Their apical surfaces are covered in a layer of cilia, which circulate CSF around the CNS. Ref: guyton and hall textbook of medical physiology 12 edition page number:813,814,815