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
Altruism is an example for 
Select and explain. 
A. Narcissistic defense mechanism, B. Neurotic defense mechanism, C. Immature defense mechanism, D. Mature defense mechanism
D: Mature defense mechanism
Answer: D: Mature defense mechanism 
Explanation: Altruism is a mature defense mechanism where an individual satisfies his internal needs by satisfying others.
Ex: A person who lost his son during accidents, started educating & campaigning people about road safety measures.