This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy and EEG, Subject name: Medicine
Lennox Gastaut syndrome is characterized by: 
Select and explain. 
A. Single seizures type, B. Occurs in adults, C. Good prognosis with adequate control, D. EEG showing less than 2.5 Hz spike and wave discharge
D: EEG showing less than 2.5 Hz spike and wave discharge
Answer: D: EEG showing less than 2.5 Hz spike and wave discharge 
Explanation: Lennox-Gastaut syndrome Occurs in children. Multiple seizure types: i) GTCS ii) Atypical absence iii) Atonic seizure Etiology = multifactorial EEG = <2.5 Hz spike & slow wave D.O.C =Na valproate * Is associated with CNS disease or dysfunction from a variety of causes, including de novo mutations, developing abnormalities, perinatal hypoxia/ ischemia. * Has poor prognosis due to underlying CNS disease.