In the description of the following experiment, determine the experimental factor. During a study testing a new vaccine for Zika virus, the research team grouped the volunteers enrolled for the test into Group A and Group B. Group A received an inert drug (placebo) while Group B received the vaccine.
Select the correct answer below:
- whether or not a person contracts the Zika virus
- the effectiveness of the new vaccine
- the drug received by each group
- the group receiving the new vaccine
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