Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Lennox-Gastaut syndrome ?
    ### Response:
    Lennox-Gastaut syndrome is a form of severe epilepsy that begins in childhood. It is characterized by multiple types of seizures and intellectual disability. This condition can be caused by brain malformations, perinatal asphyxia (lack of oxygen), severe head injury, central nervous system infection and inherited degenerative or metabolic conditions.
    