Which of the following would be classified under Schizophrenia spectrum disorders?

Schizophreniform Disorder is classified under the Schizophrenia Spectrum and Other Psychotic Disorders in the DSM-5. This classification includes disorders that are characterized by the presence of psychotic symptoms such as delusions, hallucinations, disorganized speech, and negative symptoms. Schizophreniform Disorder specifically includes symptoms similar to those of schizophrenia but lasts for a shorter duration, ranging from one to six months. This condition is crucial for differential diagnosis, as it helps clinicians identify and manage patients who may develop longer-term disorders like schizophrenia.

The other options listed fall under different categories in the DSM-5. Generalized Anxiety Disorder is an anxiety disorder characterized by excessive worry across various domains but does not involve psychotic symptoms. Post-Traumatic Stress Disorder involves symptoms related to exposure to traumatic events but, again, does not feature the same psychotic characteristics associated with schizophrenia-related disorders. Obsessive-Compulsive Disorder is primarily focused on obsessions and compulsions, which are not psychotic in nature. Therefore, Schizophreniform Disorder distinctly fits within the Schizophrenia spectrum due to its psychotic symptomatology and duration criteria.