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
Incidence of disease among exposed minus that of non exposed is equal to - 
Select and explain. 
A. Relative risk, B. Attributable risk, C. Odd ratio, D. None of the above
B: Attributable risk
Answer: B: Attributable risk 
Explanation: 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)