Smoking Participants of a Cohort Study Are More Likely to Drop

Multiple Choice

Smoking participants of a cohort study are more likely to drop out.It is known that the effect of asbestos on getting cancer is much stronger among smokers.When analyzing data for this study,researchers find no association between asbestos and cancer.A potential explanation for the results of the study is

A) confounding.
B) effect modification.
C) selection bias.
D) information bias.
E) specificity of association.