Based on the imaginary scenario, identify which variable is an effect modifier:  Taking a drug A causes patients to be 3 times more likely to fall asleep unexpectedly compared to those who do not take drug A. Those who take drug A  and drink alcohol are 6 times more likely to fall asleep unexpectedly compared to those who do not take drug A and those who take drug A and do not drink alcohol are 2 times more likely to fall asleep unexpectedly compared to those who do not take drug A. Which variable is the effect modifier?      Alcohol      Smoking      Fall asleep unexpectedly      Drug A

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