This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Sullivan index denotes: September 2006 
Select and explain. 
A. Life expectancy at bih, B. Life expectancy excluding disability free period, C. Contraceptive failure rate, D. Hookworm density in stool
B: Life expectancy excluding disability free period
Answer: B: Life expectancy excluding disability free period 
Explanation: Ans. B: Life expectancy excluding disability free period This index (expectation of life free of disability) is computed by subtracting from the the life expectancy the probable duration of bed disability and inability to perform major activities, according to cross-sectional data from the population surveys. It is one of the most advanced indicators of disability rates currently available.