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': "Years of life lost to premature death and years lived with disability is known as - \nSelect and explain. \nA. HALE, B. DALY's, C. Suullivan's index, D. HDI", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., DALY's", 'role': 'assistant'}]