Which of the following disorders is included in primary depressive disorder?

The correct choice, which identifies a disorder included in primary depressive disorders, is Disruptive Mood Dysregulation Disorder (DMDD). This disorder is classified as a mood disorder in the DSM-5, and it is characterized by persistent irritability and frequent episodes of extreme behavioral dyscontrol. It primarily affects children and adolescents, highlighting issues related to mood regulation.

Primary depressive disorders, such as Major Depressive Disorder and Persistent Depressive Disorder (Dysthymia), focus on the core symptoms of depression, including low mood, anhedonia, and changes in sleep or appetite. DMDD aligns with these core features, particularly in terms of mood disturbance and behavioral manifestations of dysphoric states.

In contrast, the other options represent different categories of disorders that do not directly fall under the umbrella of primary depressive disorders. Generalized Anxiety Disorder is primarily an anxiety disorder, while Obsessive-Compulsive Disorder is classified as an obsessive-compulsive and related disorder. Schizophrenia, on the other hand, is categorized as a psychotic disorder. Therefore, DMDD is the appropriate answer as it shares a focus on mood dysregulation associated with primary depressive disorders.