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': 'Mainly included in child survival index - \nSelect and explain. \nA. MMR, B. IMR, C. Moality between 1 to 4 yr age, D. Under 5 moality', 'role': 'user'}, {'content': "Answer: D \nExplanation: Park's textbook of preventive and social medicine 23rd edition. * The basic measure of infant and child survival is the under 5 moality.", 'role': 'assistant'}]