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
[{'content': 'Dawson disease is: \nSelect and explain. \nA. SSPE, B. Acute disseminated encephalomyelitis, C. Neuromyelitis optica, D. Multiple Sclerosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]