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 most suitable measure for assessing the etiological role of a factor in a disease is \nSelect and explain. \nA. Relative risk, B. Case fatality rate, C. Attributable risk, D. Population attributable risk', 'role': 'user'}, {'content': "Answer: A \nExplanation: The relative risk (RR) or risk ratio is the ratio of the probability of an outcome in an exposed group to the probability of an outcome in an unexposed group. It's a direct measure of the association between suspected cause and effect. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 86", 'role': 'assistant'}]