Question: When needing to select controls, what must be ensured in order to estimate an unbiased measure of association based on the study design? Please select

When needing to select controls, what must be ensured in order to estimate an unbiased measure of association based on the study design?

Please select the most appropriate response below and explain in 1-2 sentences why the response is correct.

a. That selection of participants is independent of exposure and disease b. That selection of participants is independent of exposure c. That selection of participants is independent of disease

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