Borderline personality disorder belongs to which cluster?

• A. Cluster B
• B. Cluster A
• C. Cluster C
• D. Not a cluster

Answer: (A)

Classification of personality disorders into clusters based on shared patterns of behavior and symptoms is being tested. Borderline personality disorder shows intense, unstable emotions, rapid mood changes, fear of abandonment, and impulsive behavior. These traits fit the dramatic/erratic cluster, which groups disorders characterized by emotionality and unstable relationships, such as antisocial, histrionic, and narcissistic. Other clusters describe different patterns: the odd/eccentric cluster includes paranoid, schizoid, and schizotypal types, and the anxious/fearful cluster includes avoidant, dependent, and obsessive-compulsive personality disorders. So this disorder belongs to the dramatic/erratic cluster.