Final answer:
Autism Spectrum Disorders (ASD) are listed under Axis I in the DSM-5, which categorizes clinical disorders. Autism spectrum disorder is a neurodevelopmental disorder that affects social communication and behavior.
Step-by-step explanation:
Autism Spectrum Disorders (ASD) are listed under Axis I in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), which is a classification system used by mental health professionals to diagnose and categorize mental disorders. Axis I includes clinical disorders such as major depressive disorder, attention deficit hyperactivity disorder (ADHD), and schizophrenia. Autism spectrum disorder is categorized under Axis I because it is considered a neurodevelopmental disorder that affects an individual's social communication and behavior.