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': 'Altruism is an example for \nSelect and explain. \nA. Narcissistic defense mechanism, B. Neurotic defense mechanism, C. Immature defense mechanism, D. Mature defense mechanism', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Altruism is a mature defense mechanism where an individual satisfies his internal needs by satisfying others.\nEx: A person who lost his son during accidents, started educating & campaigning people about road safety measures.', 'role': 'assistant'}]