**Core Concept**
A cohort study is a type of observational study where a group of individuals (cohort) is followed over time to assess the development or progression of a disease or outcome. This study design is used to investigate the relationship between exposure and outcome, often to identify potential risk factors or causes of a disease.

**Why the Correct Answer is Right**
Cohort studies involve the prospective or retrospective follow-up of a cohort of individuals who share a common characteristic, such as exposure to a particular substance or risk factor. The cohort is then monitored for the development of the outcome of interest, allowing researchers to assess the temporal relationship between the exposure and outcome. This design is particularly useful for studying chronic diseases or conditions that develop over a long period.

**Why Each Wrong Option is Incorrect**
**Option A:** Not enough information is provided to determine whether this option is correct or incorrect.
**Option B:** This option is likely incorrect because it does not specify a study design.
**Option C:** This option is likely incorrect because it does not describe a study design.

**Clinical Pearl / High-Yield Fact**
Cohort studies are a crucial component of epidemiological research, allowing researchers to identify potential risk factors and causes of disease. However, cohort studies can be subject to biases, such as selection bias and confounding, which must be carefully considered when interpreting results.

**Correct Answer: C.**