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': 'Potential Suppo Ratio (PSR) is defined as: \nSelect and explain. \nA. Number of persons aged 15-65 per children below 15 years, B. Number of persons aged 15-65 per one older person aged >/= 65 years, C. Number of person aged 15-65 per one older person aged > 65 and younger person < 15 years, D. Number of persons aged 15-65 persons older person aged > 60 and younger person < 15 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: PSR =Potential Suppo Ratio (PSR) is defined as Number of persons aged 15-65 per one older person aged >/= 65 years Gives burden on working population PSR a 1/ Old age dependency ratio', 'role': 'assistant'}]