A doctor wants to develop a pill to help people with peanut allergies.  Her goal is to prevent the dangerous symptoms that occur when a person allergic to peanuts contacts the nuts.  She splits her patients into two groups.  The first group receives the new pill, and the second group receives a pill with inactive ingredients.  Over the course of a couple of months, all patients are tested for desensitization of peanuts. Treatment:  Placebo:

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