Which issue in epidemiology asks whether the amount of disease varies with the amount of exposure to a factor?

• A. Does the association imply causation?
• B. Does the amount of disease vary with the amount of exposure to the factor?
• C. Are there economic implications for the health system?
• D. Should findings be generalized to settings other than where the research was conducted?

Answer: (B)

Dose–response relationship is the idea being tested. It asks whether increasing exposure to a factor leads to a higher amount or rate of disease. When you see a clear gradient where more exposure corresponds to more disease, it strengthens the case that the exposure may be causing the disease, because the outcome changes in step with the level of exposure. Think of how smoking intensity or duration is linked to higher lung cancer risk—the more exposure, the greater the risk. The other considerations address different questions, such as whether there is causation in general (not tied to dose), economic implications, or whether findings apply to other settings; they don’t specifically assess whether disease varies with the amount of exposure.