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': 'Quality indicator of MCH services - \nSelect and explain. \nA. IMR, B. MMR, C. CMR, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Park's textbook of preventive and social medicine 23rd edition. * IMR is an impoant indicator of health status of a community and effectiveness of MCH services in paicular.", 'role': 'assistant'}]