This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psychoanalysis, Subject name: Psychiatry
[{'content': 'Of the following defense mechanisms, which is considered the most mature? \nSelect and explain. \nA. Denial, B. Sublimation, C. Dissociation, D. Regression', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sublimation: expressing an unacceptable emotion in a socially acceptable way, is classified as a mature defense mechanism. Denial, dissociation, regression, and intellectualization are all classified as less mature defense mechanisms.', 'role': 'assistant'}]