What Causes the Pain in Post-Herpetic Neuralgia,diabetic Neuropathy,and Guillain-Barré Syndrome

Multiple Choice

What causes the pain in post-herpetic neuralgia,diabetic neuropathy,and Guillain-Barré syndrome?

A) Psychological abnormalities
B) Ectopic foci
C) Central nervous system response to small fiber deafferentation
D) Pain matrix dysfunction
E) Reduced activity in pain inhibition areas of the cerebral cortex