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': 'One DALY signifies \nSelect and explain. \nA. 1 year of disease free life, B. 1 lost year of healthy life, C. 1 month of bedridden life, D. 1 day of diseased life', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DALY is a measure of overall disease burden, expressed as a number of years lost due to ill-health, disability or early death. 1 DALY = 1yr of healthy life lost Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition; Page 26', 'role': 'assistant'}]