This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'In a population, total births in a year are 3050. There are 50 still births, 100 neonates die in first  7 days and 150 die in next 8-28th day life. Calculate Neonatal Mortality Rate. \nSelect and explain. \nA. 250, B. 100, C. 83, D. 90', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]