[{"role": "user", "content": "I'm trying to understand the nuances of human behavior and I'd love to learn how to express this thought in Italian, so could you please help me translate the sentence 'He must be selfish' into Italian?"}, {"role": "assistant", "content": "The translation of 'He must be selfish' in Italian is 'Lui deve essere egoista.' This sentence conveys the idea that the person in question is likely to prioritize their own interests over others, which is a key aspect of selfish behavior."}]