**Core Concept**
A case-control study is a type of observational research design used to investigate the association between a particular exposure or risk factor and a specific outcome or disease. This study design involves comparing individuals with the outcome of interest (cases) with individuals without the outcome (controls) to identify potential risk factors or causes.

**Why the Correct Answer is Right**
In a case-control study, the researcher typically starts with the outcome of interest (e.g., a disease or condition) and then retrospectively assesses the exposure or risk factors that may be associated with it. This design is particularly useful for studying rare outcomes or diseases where a cohort study may be impractical. By comparing cases with controls, researchers can estimate the relative risk of developing the outcome associated with a particular exposure or risk factor. This study design is often used in epidemiological research to identify potential risk factors for diseases and to inform public health policy.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because a case-control study is not used to measure incidence, which is the number of new cases of a disease or outcome that occur within a specified period of time. Incidence is typically measured using a cohort study.

**Option B:**
This option is incorrect because a case-control study is not used to measure prevalence, which is the total number of cases of a disease or outcome in a population at a given time. Prevalence is typically measured using a cross-sectional study.

**Option C:**
This option is incorrect because a case-control study is not used to measure mortality, which is the number of deaths from a disease or outcome within a specified period of time. Mortality is typically measured using a cohort study or a vital statistics registry.

**Clinical Pearl / High-Yield Fact**
When designing a case-control study, researchers should carefully select the controls to ensure that they are representative of the population of interest and that they do not have the outcome of interest. This can be achieved by using population-based controls or by using hospital controls that are matched to the cases.

**Correct Answer:** D. association between a particular exposure or risk factor and a specific outcome or disease.