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': 'Incidence of disease among exposed minus that of non exposed is equal to - \nSelect and explain. \nA. Relative risk, B. Attributable risk, C. Odd ratio, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Attributable risk indicates to what extent the disease under study can be attributed to the exposures. It is often expressed as a percent (refer pgno:78 park 23 rd edition)', 'role': 'assistant'}]