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
[{'content': 'Which of the following is an immature defense mechanism? \nSelect and explain. \nA. Anticipation, B. Humor, C. Suppression, D. Regression', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Regression is where a person returns back to earlier phase of development to avoid the tensions & conflicts of present phase of development.\nEx: A\xa0businessman who is stressed because of financial problems goes to a park & plays with children.', 'role': 'assistant'}]