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': 'Sullin index: \nSelect and explain. \nA. Measures disability, B. Measures life years adjusted with disability, C. Measures like expectancy adjusted without disability or free of disability, D. Measures life expectancy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Measures like expectancy adjusted without disability or free of disability', 'role': 'assistant'}]