This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Indicators of Health, Subject name: Social & Preventive Medicine
[{'content': 'Sullivan index indicates: \nSelect and explain. \nA. Life free of disability, B. Hookworm eggs/ gm of stool, C. Standard of living, D. Pregnancy rate per HWY', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Life free of disability* The simplest index of health which incorporates morbidity as well as mortality is Sullivan's Index of Disability-Free Life Expectancy (DFLE)ALSO REMEMBER* Chandler's Index: Hookworm eggs/gm of stool* Standard of living : Income and occupation, standards of housing, sanitation and nutrition, level of provision of health, educational, recreational and other services* Pregnancy rate per HWY: Pearl Index (Failure rate of Contraceptives)", 'role': 'assistant'}]