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
Relative risk is defined as- 
Select and explain. 
A. Incidence of disease among exposed minus incidence of disease among non-exposed, B. Incidence of disease among non-exposed minus incidence of disease among exposed, C. Incidence of disease among non-exposed divided by incidence among exposed, D. Incidence of disease among exposed divided by incidence among non-exposed
D: Incidence of disease among exposed divided by incidence among non-exposed
Answer: D: Incidence of disease among exposed divided by incidence among non-exposed 
Explanation: Ans. is 'd' i.e., Incidence of disease among exposed divided by incidence among non-exposed * Relative risk is the ratio of the incidence of the disease (or death) among exposed and the incidence among nonexposed.RR =Incidence of disease among exposed----------------------------------Incidence of disease among nonexposed