Which cluster is the dramatic, emotional, or erratic cluster that includes antisocial, histrionic, narcissistic, and borderline personality disorders?

• A. Cluster A
• B. Cluster B
• C. Cluster C
• D. Catatonic stupor

Answer: (B)

Classification of personality disorders groups disorders by similar patterns of behavior and emotion. The dramatic, emotional, or erratic cluster is the one that includes antisocial, borderline, histrionic, and narcissistic personality disorders. Disorders in this cluster tend to involve intense, unstable, or attention-seeking behaviors and relationships. That’s why this cluster fits best for those four conditions.

The other clusters describe different patterns: one is all about odd or eccentric ways of thinking and behaving, and the other about anxious or fearful patterns. Catatonic stupor isn’t a cluster at all—it's a motor or behavioral symptom seen in certain conditions, not a personality-disorder cluster.