In a case-control study of a suspected association between breast cancer and the contraceptive pill, all of the following are true statements except?
**Core Concept**
A case-control study is a type of observational study that investigates the association between a particular exposure (e.g., contraceptive pill) and a specific outcome (e.g., breast cancer). This study design is useful for identifying potential risk factors or causes of a disease.
**Why the Correct Answer is Right**
In a case-control study, researchers select participants based on their outcome status (cases with the disease and controls without the disease). The study then retrospectively assesses the exposure history of both groups to identify potential associations. This approach allows researchers to examine the relationship between the exposure and the outcome, while controlling for other potential confounding factors.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true. Case-control studies are often used to investigate rare outcomes, such as breast cancer.
**Option B:** This statement is true. Case-control studies can identify potential risk factors or causes of a disease by comparing the exposure history of cases and controls.
**Option C:** This statement is true. Case-control studies are useful for investigating the association between a particular exposure and a specific outcome.
**Clinical Pearl / High-Yield Fact**
A key limitation of case-control studies is the potential for recall bias, as participants may misremember their exposure history. This can lead to incorrect conclusions about the association between the exposure and the outcome.
**Correct Answer: D.