This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
Massive myoclonus is a hallmark of which stage of SSPE? 
Select and explain. 
A. Stage 1, B. Stage 2, C. Stage 3, D. Stage 4
B: Stage 2
Answer: B: Stage 2 
Explanation: Ans. B. Stage 2Clinical stages of subacute sclerosis panencephalitis:StageClinical manifestationsStage IPersonality changes, failure in school, strange behaviorStage IIMassive, repetitive, and frequent myoclonic jerks, seizures and dementiaStage IIIRigidity, extrapyramidal symptoms, and progressive unresponsivenessStage IVComa, vegetative state, autonomic failure, and akinetic mutism