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
Ratio of incidence among exposed and non exposed is known as ? 
Select and explain. 
A. Risk ratio, B. Odds ratio, C. Attributable risk, D. SAR
A: Risk ratio
Answer: A: Risk ratio 
Explanation: Ans. is 'a' i.e., Risk ratio Relative risk (risk ratio) Relative risk is the ratio of the incidence of the disease (or death) among exposed and the incidence among nonexposed.