This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': "Burden of disease is detected by \nSelect and explain. \nA. DALY, B. Sullivan's Index, C. IMR, D. Survival index", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Disability Adjusted Life Years (DALY) is a measure of overall disease burden expressed as a number of years lost due to ill health, disability or early death. Ref: 25th edition Park&;s Textbook of Preventive and Social Medicine, Page no. 26', 'role': 'assistant'}]