The Focus on Neuroscience box, ''The Mysterious Placebo Effect,'' described a PET-scan study on the placebo effect. How were the two groups of participants in the study different?
A) One group received the actual opioid painkiller, and the other group received the drug naloxone.
B) One group was injected with an opiate painkiller, and the other group was injected with endorphins.
C) One group was injected with an opiate painkiller, and the other group was injected with saline solution (a placebo) .
D) One group was injected with saline solution (a placebo) , and the other group received no injection or other treatment.
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