This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psychoanalysis, Subject name: Psychiatry
Which of the following is not a neurotic defense mechanism? 
Select and explain. 
A. Isolation, B. Regression, C. Reaction formation, D. Undoing
B: Regression
Answer: B: Regression 
Explanation: Regression is an immature defense mechanism. Rest all are neurotic defense mechanism. Eg of neurotic defense mechanism - Displacement Repression Rationalization Reaction formation Intellectualization Isolation of affect Undoing Aim inhibition