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': 'Which is the best index for burden of disease and effectiveness of interventions \nSelect and explain. \nA. Case fatality rate, B. Disability adjusted life years, C. Dependent ratio, D. Morbidity data', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Disability adjusted life years (DALYs) : Is a measure of the burden of disease in a defined population and the effectiveness of interventions; it expresses years lost to premature death and years lived with disability adjusted for its severity. Ref : Park 25th edition Pgno : 26', 'role': 'assistant'}]