This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definition & Concepts, Subject name: Social & Preventive Medicine
[{'content': 'In a population having mid-year population of 1000, there are 150 children less than 15 years and 50 elderly more than 65 years of age. Calculate dependency ratio ? \nSelect and explain. \nA. 0.2, B. 200, C. 0.25, D. 250', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dependency ratio = (Propoion of ppl in < 15yrs of age + >65yrs of age) / Propoion of ppl in 15-64 yrs of age = 150+50/800 = 0.25', 'role': 'assistant'}]