<prompt> Landau-Kleffner syndrome is characterized by all of following exceptSeizureLoss of language skillNormal EEG during sleepNormal brain CT scan  <response>: Ans. C. Normal EEG during sleep Ref : Nelson Textbook of Pediatrics 20thed p2837ExplanationLandau-Kleffner syndrome is a condition of unknown cause characterized by: Loss of language skills attributed to auditory agnosia in a previously normal child Seizures focal, generalized tonic-clonic, atypical absence, partial complex, and, occasionally, myoclonic seizures. High-amplitude spike-and-wave discharges ON EEG which are always more apparent during non-rapid eye movement sleep; thus, a child in whom Landau-Kleffner syndrome is suspected should have an EEG during sleep, particularly if the awake record is normal. CT and MRI studies typically yield normal results. 