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
All are treatable diseases of spinal cord EXCEPT ? 
Select and explain. 
A. ALS, B. Multiple sclerosis, C. Syringomyelia, D. A-V malformation
A: ALS
Answer: A: ALS 
Explanation: Answer- A. ALSInflammatory : Multiple sclerosis, Neuromyelitis optica, transverse myelitis, sarcoidosis, SLE, vasculitisDevelopmental : Syringomyelia, meningomyelocele, tethered cord.Metabolic: Vitamin B12 deficiency (subacute combined degeneration), copper deficiency.Infections: CMV HSV, HTLV-I, HIV