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 index 
Select and explain. 
A. Measures disability, B. Measures life years adjusted with disability, C. Measures life expectancy adjusted without disability or free of disability, D. Measures life expectancy
C: Measures life expectancy adjusted without disability or free of disability
Answer: C: Measures life expectancy adjusted without disability or free of disability 
Explanation: Sullivan index: Also called DFLE (disability-free life expectancy) : is the 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