A research study found that an event occurred in 10 individuals given a new medication, and the event did not occur in 20 individuals given the new medication. It also found that the event occurred in 40 individuals not given the medication, and the event did not occur in 80 individuals not given the new medication. What is the odds ratio of the event occurring?

1.0.25
2.0.5
3.1
4.2

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