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
Type C personality disorder 
Select and explain. 
A. Avoidant personality disorder, B. Histronic personality disorder, C. Paranoid personality disorder, D. Narcissistic personality disorder
A: Avoidant personality disorder
Answer: A: Avoidant personality disorder 
Explanation: Cluster C has disorders considered "anxious and fearful" and characterised by "introversion". These include Anxious (Avoidant), Dependent and Obsessive Compulsive (or Anankastic) personality disorders. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no. 113