Epidemiologists Tried to Investigate the Role of Factor X in the Exposure-Disease

Multiple Choice

Epidemiologists tried to investigate the role of factor X in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor X.Based on the information given,what is the role of factor X in the exposure-disease relationship? $\text { Overall }$
$\begin{array}{|l|l|l|}\hline & \text { Case } & \text { Control } \\\hline \text { Exposed } & 1,000 & 500 \\\hline \text { Unexposed } & 200 & 500\\\hline\end{array}$

$\text { Factor } Y \text { present }$
$\begin{array}{|l|l|l|}\hline & \text { Case } & \text { Control } \\\hline \text { Exposed } & 800 & 250 \\\hline \text { Unexposed } & 100 & 250 \\\hline\end{array}$

$\text { Factor } Y \text { absent }$
$\begin{array}{|l|l|l|}\hline & \text { Case } & \text { Control } \\\hline \text { Exposed } & 200 & 250 \\\hline \text { Unexposed } & 100 & 250 \\\hline\end{array}$

A) Factor X is a confounder.
B) Factor X is an effect measure modifier.
C) Factor X is a mediator.
D) Factor X is an outcome.
E) Factor X does not have any role in the exposure-disease relationship.