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Nick designs a clinical trial to test a new anxiety medication by creating a control group and a treatment group. If he gives the medication

Nick designs a clinical trial to test a new anxiety medication by creating a control group and a treatment group. If he gives the medication to patients in the treatment group and not to the control group, some patients might find out that they're not being treated. To improve his study, Nick decides to give a sugar pill to the control group.

The sugar pill is an example of a __________.

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