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
Attributable risk is the impoant parameter for:- 
Select and explain. 
A. Clinicians, B. Epidemiologists, C. Public health program managers, D. Microbiologists
B: Epidemiologists
Answer: B: Epidemiologists 
Explanation: AR Difference in incidence rates of disease (or death) b/w an exposed group & non-exposed group. It indicates to what extent the disease under study can be attributed to the exposure. Aka "risk difference"/ Excess risk/ Absolute risk. Used by epidemiologists. Attributable risk is often expressed as a percent. This is given by the formula :Incidence of disease rate among exposed - incidence of disease rate among non-exposed--- ---------- -------------------------------------------------------------------------------------- xlOOIncidence rate among exposed - RR - used by Clinicians - PAR -useful for National health programmes and policies