Answer:
Be dramatic, overly emotional and unpredictable.
Explanation:
Personality disorders are divided into three main clusters, Cluster A: containing Paranoid, Schizotypal and schizoid personality disorder, Cluster B: Containing Antisocial, Borderline, Histrionic and Narcissistic personality disorder, and Cluster C: Containing Evasive, Obsessive-compulsive and Dependent personality disorder.
Cluster B is also known as the Erratic group.
People who are diagnosed with disorders belonging to this group tend to be overly dramatic, emotional and unpredictable. They also tend to be manipulative, enjoy using others and some can lack empathy, especially if they are diagnosed with either narcissist or antisocial personality disorder.