This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Definition of Population attributable risk 
Select and explain. 
A. Estimate of amount of disease that can be reduced if risk factor is modified/ eliminated, B. Difference in risk of exposed and non-exposed groups, C. Risk of disease among exposed as compared to nonexposed, D. Extent to which disease can be attributed to risk factor under study
A: Estimate of amount of disease that can be reduced if risk factor is modified/ eliminated
Answer: A: Estimate of amount of disease that can be reduced if risk factor is modified/ eliminated 
Explanation: None