This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Personality disorders, Subject name: Psychiatry
[{'content': 'All are cluster B disorders of personality except \nSelect and explain. \nA. Antisocial, B. Narcissistic, C. Avoidant, D. Borderline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cluster B consists of disorders considered "dramatic, emotional and erratic" and on a "psychopathic continuum". They have dramatic, impulsive and erratic features. There are 4 disorders that are classified under cluster B. It includes Antisocial (or Dissocial), Histrionic, and Borderline (or Emotionally Unstable) personality disorders. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no. 113 Kaplan and sadock synopsis of psychiatry, 11th edition, page no.742', 'role': 'assistant'}]