According to DSM-5, Autism Spectrum Disorder (ASD) collapses previous subtypes from DSM-IV. Which of the following DSM-IV diagnoses was subsumed into ASD in DSM-5, alongside Autistic Disorder, PDD-NOS, and Childhood Disintegrative Disorder?

• A Rett Syndrome
• B Selective Mutism
• C Social Communication Disorder
• D Asperger's Disorder ✓

Explanation

DSM-5 merged Autistic Disorder, Asperger's Disorder, PDD-NOS, and Childhood Disintegrative Disorder into a single Autism Spectrum Disorder diagnosis. Rett Syndrome (now known to have a specific MECP2 genetic cause) was removed from ASD in DSM-5 and is now listed only in the genetic section. Social Communication Disorder is a new DSM-5 category for children with social pragmatic communication deficits without the repetitive behaviours required for ASD. Selective Mutism is classified under Anxiety Disorders in DSM-5.

Reference: Kaplan & Sadock's Synopsis of Psychiatry, 11th ed.

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