In a psychological study aimed at testing a medicine for reducing stress levels, the researcher grouped the participants

[answerhappygod]

In a psychological study aimed at testing a medicine forreducing stress levels, the researcher grouped the participantsinto 2 groups and gave a stress-reduction pill to one group and aplacebo pill to another group.
In the description of the above situation, determine the controlgroup
1-The group that received the stress-reduction pill is thecontrol group.
2-The group that received the placebo pill is the controlgroup.
3-Both the groups are control groups.
4-Stress levels of the participants after treatment.