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 immature defense mechanism? 
Select and explain. 
A. Anticipation, B. Humor, C. Suppression, D. Regression
D: Regression
Answer: D: Regression 
Explanation: Regression is where a person returns back to earlier phase of development to avoid the tensions & conflicts of present phase of development.
Ex: A businessman who is stressed because of financial problems goes to a park & plays with children.