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: Social & Preventive Medicine
[{'content': 'Human development index includes -a) Crude death rateb) Life expectancy at one yearc) Life expectancy at birthd) Adult literacy ratee) GDP \nSelect and explain. \nA. ae, B. edb, C. cde, D. bd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]