A study claims that the combination of vitamin C with vitamin E is more effective for preventing the flu than vitamin C alone.

Question

A study claims that the combination of vitamin C with vitamin E is more effective for preventing the flu than vitamin C alone. In the study, a group of researchers studied 1132 subjects. The subjects were randomly assigned to out of three study groups. The first group of 310 subjects were instructed to take 600 mg daily of vitamin C. The second group of 418 subjects were instructed to take 600 mg of vitamin C and 200 IU of vitamin E daily. The third group of 404 subjects were instructed to take 600 mg of vitamin C and 400 IU of vitamin E daily. The incidence of flu over a season was recorded. All subjects knew which treatment they were receiving.
In this study, which is the control group?
the 1132 subjects
the second group of 418 taking 200 IU of vitamin E
the third group of 404 taking 400 IU of vitamin E
the first group of 310 taking vitamin C alone
There is no control group.
This study is
blind, but not double-blind
not an experiment
not blind.
double-blind
none of the above

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