Biostatistics: quiz question exposed vs. non exposed

Relative risk (RR), in biostatistics, is a measure used to compare the risk of a certain event occurring in one group with the risk of it occurring in another group. It is commonly used in epidemiological and clinical research to assess the effect of an exposure or an intervention on an outcome, such as the development of a disease or a health-related condition. Relative risk is calculated as the ratio of the probability of the event occurring in the exposed group to the probability of the event occurring in the unexposed (or control) group. Problem: The rate that an outcome will occur given a particular exposure, compared to the rate of the outcome occurring in the absence of that exposure is definition of which of the following? A) Incidence rate B) Prevalence rate C) Odds ratio D) Relative risk * E) Confidence Interval