How Does Degeneration of the CNS Differ from That of the PNS

Multiple Choice

How does degeneration of the CNS differ from that of the PNS?

A) Only in the PNS does degeneration occur distal to the point of injury.
B) Oligodendrocytes,like Schwann cells,provide trophic factors to sprouting axons.
C) Groups of neurons in the vicinity of a lesion are more likely to die in the CNS than PNS.
D) In the PNS,the clearance of debris of necrotic tissue occurs more slowly than in the CNS.