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': 'Mature defence mechanism is seen in: \nSelect and explain. \nA. Altruism, B. Repression, C. Regression, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Altruism', 'role': 'assistant'}]