Control group is a group which is used as a benchmark or standard for comparison of the changes that occur in the dependent or experimental variable. This group does not receive any treatment in the experiment but only kept for the purpose of comparison with other variables.
In the given study, the use of the group that does not take the drug is the example of the control group.
Reading the Food Label the serving size determines how much food that can feed a set amount of people for example Kraft mac and cheese has a serving size of 2-4 people which means that is roughly how many people you can feed on that box .