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
Which of the following clinical features of demyelinating myelopathy least likely suggests a progression to multiple sclerosis? 
Select and explain. 
A. Complete cord transection, B. Bilateral visual loss, C. Absence of oligoclonal bands, D. Poor prognosis
C: Absence of oligoclonal bands
Answer: C: Absence of oligoclonal bands 
Explanation: Answer: c. Absence of oligoclonal bands (Ref Harrison I9/e p2656. 18/e p3372)Oligoclonal bands are variable; but when bands are present, a diagnosis of MS is more likely, thus absence of oligoclonal bands suggests a less likely progression to MS.