This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Feature of "Anankastic" personality disorder is 
Select and explain. 
A. Procrastination, B. Lack of impulse control, C. Rigidity and stubbornness, D. All of the above
C: Rigidity and stubbornness
Answer: C: Rigidity and stubbornness 
Explanation: Anankastic personality is also known as obsessive-compulsive personality disorder. They are very rigid and stubborn. The other characteristics are Punctuality, perfectionism, Excessive doubt & caution, Bound to rules & regulation, Highly moralistic, Preoccupation with details rules, lists and order. There is no risk of obsessive-compulsive disorder in future but there is risk of depression.