The psychological disorder characterized by separate episodes of depression and mania is

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The psychological disorder referred to in the question is bipolar disorder. This is characterized by alternating episodes of depression and mania (or hypomania). Posttraumatic stress disorder (B) is characterized by symptoms such as flashbacks, intrusive thoughts, and avoidance behaviors after experiencing a traumatic event. Schizophrenic disorder (C) involves symptoms such as delusions, hallucinations, disorganized speech and behavior, and negative symptoms such as social withdrawal or lack of motivation. Major depressive disorder (D) is a psychological disorder characterized by persistent feelings of sadness or lack of interest in activities, but without the presence of manic or hypomanic episodes.

The Psychological Disorder Characterized by Separate Episodes of Depression and Mania