Which of the following is an example of a mood disorder?

Mood disorders are a category of mental health conditions characterized primarily by disturbances in mood or emotional state. The inclusion of dysthymic disorder, bipolar disorder, and major depression exemplifies this category regarding the varied presentation of mood-related symptoms.

Dysthymic disorder, now more commonly referred to as Persistent Depressive Disorder, is characterized by chronic depressive symptoms that are less severe than major depression but can last for years. Bipolar disorder involves episodes of mood swings ranging from depressive lows to manic highs, indicating significant alterations in mood. Major depression encompasses more acute episodes of severe mood disturbances, impacting daily functioning and quality of life.

The other options provided reflect different categories of mental health disorders. Obsessive-compulsive disorder is classified as an anxiety disorder, primarily involving unwanted repetitive thoughts (obsessions) and behaviors (compulsions). Post-traumatic stress disorder is categorized under trauma and stressor-related disorders, resulting from exposure to a traumatic event rather than a mood disturbance. Anxiety disorders encompass conditions characterized by excessive fear or anxiety, which further separates them from the classifications of mood disorders.

Thus, the correct option specifically illustrates a range of disorders that occur primarily through disturbances in emotional and mood regulation.