<prompt> True about autismOccurs in high economic striataNormal communicationStarts before 23 years of ageMore common in girls  <response>: Autism Autism is a neurologic disroder characterized by -Qualitative impairment in social interactionQualitative impairment in communication.Restricted repetitive and streotyped patterns of behaviour, interests, and activities.Onset of symptoms is usually before 3 years of age.3-5 times more common in boys, but more severe when occurs in girls.More common among low socio-economic groups.Clinical featuresImpairment in communicationImpairment in social interactionInability to concentrateRestricted repetitive and streotypes patterns of behaviour, interests and activities.Failure to acquire speech.Approximately 75 of children with autism are mentally retarded.Epilepsy develops in approximately one-fifth to one-third individuals.Half of autistic patients have abnormalties on EEG. 