This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: viral infection, Subject name: Medicine
Dawson disease is: 
Select and explain. 
A. SSPE, B. Acute disseminated encephalomyelitis, C. Neuromyelitis optica, D. Multiple Sclerosis
A: SSPE
Answer: A: SSPE 
Explanation: Dawson disease SSPE (Subacute Sclerosing pan encephalitis) Late complication of measle virus which can causes myoclonus at 8 years of age Multiple Sclerosis- Dawson Fingers: MRI head Neuromyelitis Optica- Anti aquaporin - 4 A/b - T. Myelitis + Optic neuritis