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': 'Impoant indicator for socioeconomic health \nSelect and explain. \nA. Maternal moality rate, B. Perinatal moality rate, C. Under 5 moality rate, D. Infant moality rate', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed", 'role': 'assistant'}]