This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'Best indicator of availability, utilisation & effectiveness of health services- \nSelect and explain. \nA. IMR, B. MMR, C. Hospital bed OCR, D. DALY', 'role': 'user'}, {'content': "Answer: A \nExplanation: Park's textbook of preventive and social medicine 23rd edition. *IMR is universally regarded not only as an impoant indicator of health status of a community but also the level of living of people in general and effectiveness of MCH services in paicular.", 'role': 'assistant'}]