In an experiment the group that is exposed to the variable to be tested is called the

The correct answer would be the experimental group.

There are mainly two groups present in any experiment; the experimental group and the control group.

The experimental group refers to the group which receives experimental procedures or is exposed to the independent variables to be tested.

In contrast, the control group refers to the group which is kept in controlled conditions, that is, it is not exposed to the variables which are being tested.