**Core Concept**
A pre-post design is a research methodology used to assess the effectiveness of an intervention by comparing the outcomes before and after the intervention. This design is commonly used in clinical trials, quality improvement projects, and educational research to evaluate the impact of a treatment, policy, or educational program.

**Why the Correct Answer is Right**
The pre-post design relies on the principle of comparison, where the same outcome measure is administered before and after the intervention. This allows researchers to assess the change in the outcome variable over time, thereby evaluating the effectiveness of the intervention. The pre-post design is particularly useful when it is not feasible or ethical to use a control group.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a case-control study is a research design that compares individuals with a specific outcome (cases) to those without the outcome (controls), but it does not involve assessing outcomes before and after an intervention.

**Option B:** This option is incorrect because a cohort study follows a group of individuals over time to assess the development of a specific outcome, but it does not specifically involve assessing outcomes before and after an intervention.

**Option C:** This option is incorrect because a randomized controlled trial (RCT) is a research design that involves randomly assigning participants to an intervention or control group, but it does not specifically involve assessing outcomes before and after an intervention.

**Clinical Pearl / High-Yield Fact**
When using the pre-post design, it is essential to consider the potential biases and confounding variables that may affect the outcome measures, such as regression to the mean, practice effects, and changes in environmental or contextual factors.

**Correct Answer: C. Pre-post design**