Which of the following is NOT a form of dissociative disorder?

In the context of dissociative disorders, major depressive disorder does not fall into this category as it is classified as a mood disorder. Dissociative disorders are characterized by disruptions in consciousness, memory, identity, or perception, which primarily set them apart from mood disorders.

Depersonalization/derealization disorder involves persistent or recurrent experiences of feeling detached from one's body or thoughts, leading to a sense of unreality. Dissociative amnesia pertains to an inability to recall important autobiographical information, typically following a traumatic or stressful event. Dissociative identity disorder, previously referred to as multiple personality disorder, involves the presence of two or more distinct personality states, which can control the individual's behavior at different times.

While major depressive disorder can occasionally include dissociative symptoms, such as feelings of detachment or lack of emotional response, it is fundamentally a distinct condition centered on mood disturbances rather than the disruption of identity or experience of reality that defines dissociative disorders.