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
Sullivan&;s index measures- 
Select and explain. 
A. Moality, B. Morbidity, C. Infectivity, D. Disability
D: Disability
Answer: D: Disability 
Explanation: Sullivan&;s index: Also called DFLE (disability-free life expectancy) is the average number of years an individual is expected to live free of disability if current pattern of moality and disability continue to apply. Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition; Page 26