An 8-year-old boy begins to exhibit chronic, severe, persistent irritability associated with frequent temper outbursts. Which of the following disorders is he most likely to develop in adulthood?

Choice A reason: Borderline personality disorder is characterized by instability in interpersonal relationships, self-image, and affect, typically emerging in adolescence or early adulthood. While emotional dysregulation is present, chronic irritability in childhood is not a strong predictor of developing borderline personality disorder. Choice B reason: Schizophrenia involves psychosis, delusions, and hallucinations, typically emerging in late adolescence or early adulthood. Chronic irritability and temper outbursts in childhood are not predictive of schizophrenia. Choice C reason: Bipolar I disorder is characterized by episodes of mania and depression. While irritability can appear in pediatric bipolar disorder, research shows that chronic, severe irritability with frequent temper outbursts without distinct manic episodes predicts unipolar depressive disorders rather than bipolar disorder. Choice D reason: This is the correct answer. Chronic, severe irritability in childhood, especially when associated with temper outbursts, is strongly associated with the later development of unipolar depressive disorder in adulthood. It reflects persistent negative mood and emotional dysregulation rather than episodic mania.