Autism spectrum disorder encompasses a wide range of neurodevelopmental disorders including Asperger's syndrome,Rett's syndrome,and classical autism.The cause of autism is unknown but is thought to be a combination of genetic and environmental factors.Children with all types of the disorder exhibit impairment of social interaction.

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This statement is true according to current understanding of autism spectrum disorder.

Autism Spectrum Disorder Encompasses a Wide Range of Neurodevelopmental Disorders