A 4-year-old boy has onset of episodes of loss of body tone,with associated falls.as well as generalized tonic-clonic seizures.His cognitive function has been deteriorating.EEG shows 1.5-to 2-Hz spike-and-wave discharges.The most likely diagnosis is

  • A: Landau-Kleffner syndrome
  • B: Lennox-Gastaut syndrome
  • C: Juvenile myoclonic epilepsy
  • D: Mitochondrial encephalomyopathy
  • E: Febrile seizures

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