In a study examining the association between alcohol consumption and oral cancer, smoking is found to be associated with both alcohol consumption and oral cancer, and is not on the causal pathway. Smoking in this context is best described as a:

• A Effect modifier
• B Proxy variable
• C Mediator
• D Confounder ✓

Explanation

A confounder is associated with both the exposure and outcome but is not on the causal pathway. Smoking distorts the true alcohol-oral cancer association. An effect modifier changes the strength of association across strata. A mediator lies on the causal pathway between exposure and outcome. Confounding must be controlled through study design or analysis.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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