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
Which of the following better correlates with Sullivan's index: March 2009 
Select and explain. 
A. Infant moality rate, B. Life expectancy at the age of one, C. Per capita income, D. Numbers of years lived without disability
D: Numbers of years lived without disability
Answer: D: Numbers of years lived without disability 
Explanation: Ans. D: Numbers of years lived without