This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Which of the following is an example for mature defense mechanism? 
Select and explain. 
A. Intellectualization, B. Dissociation, C. Displacement, D. Suppression
D: Suppression
Answer: D: Suppression 
Explanation: Suppression is a mature defense mechanism where a person voluntarily makes decision to not to think about an distressful event and accompanying emotions.