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
[{'content': 'SuIllin index - \nSelect and explain. \nA. Measures disability, B. Measures life years adjusted with disability, C. Measures life expectancy adjusted without disability or free of disability, D. Measures life expectancy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Measures life expectancy adjusted without disability or free of disability Sullivan's index is the expectation of life free of disability. o It is computed by subtracting from the life expectancy the probable duration of bed disability and inability to perform major activities. Sullivan's index = life expectancy -- Duration of bed disability & Inability to perform minor work", 'role': 'assistant'}]