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: Medicine
Dying back neuropathy is seen in all, except: 
Select and explain. 
A. Diabetic neutropathy, B. Arsenic neuropathy, C. Porphyria, D. Gullian Bare Syndrome (GBS)
D: Gullian Bare Syndrome (GBS)
Answer: D: Gullian Bare Syndrome (GBS) 
Explanation: Dying back neuropathy or distal axonopathy is the result of some metabolic or toxic derangement of neurons. It is the most common response of neurones to metabolic or toxic disturbances, and may be caused by metabolic diseases such as diabetes, renal failure, malnutrition, toxins, drugs etc. GBS is a post infectious polyneuropathy that causes demyelination in mainly motor but sometimes also sensory nerves. It is not predominant distal axonopathy. Ref: Fundamentals of Neurology: An Illustrated Guide By Marco Mumenthaler, Heinrich Mattle, Page 176