This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'The best indicator to determine maximum benefit to the community through preventive intervention strategies is \nSelect and explain. \nA. Relative risk, B. Attributable risk, C. Absolute risk, D. Odds ratio', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Attributable risk is the difference in the rate of a condition between an exposed population and an unexposed population. It is calculated in coho studies, where individuals are assembled on exposure status and followed over a period of time.', 'role': 'assistant'}]