This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
Dying back neuropathy is seen in all except 
Select and explain. 
A. Arsenic neuropathy, B. Gullain Barre syndrome, C. Diabetic neuropathy, D. Vasculitic neuropathy
B: Gullain Barre syndrome
Answer: B: Gullain Barre syndrome 
Explanation: Guillain-Barre syndrome (GBS) is a rare condition in which a person's immune system attacks the peripheral nerves. Most people recover fully from even the most severe cases of Guillain-Barre syndrome. Severe cases of Guillain-Barre syndrome are rare, but can result in near-total paralysis. As a rule, axonal peripheral neuropathies affect the longest axons first. These are the so called "dying back" neuropathies. Transpo of proteins and nutrients from the cell body is affected early, with subsequent breakdown and loss of the most distal peripheral nerve fibers seen in arsenic , diabetic neuropathies Ref Harrison20th edition pg 2234