The Focus on Neuroscience Box, "The Mysterious Placebo Effect," Described

The Focus on Neuroscience box, "The Mysterious Placebo Effect," described a PET-scan study on the placebo effect. What was the main finding of the study?

A) Both the genuine painkiller and the placebo activated the same brain area and both relieved pain.
B) The genuine painkiller and the placebo activated different brain areas, and only the genuine painkiller relieved pain.
C) The genuine painkiller activated the anterior cingulate cortex, but the placebo inhibited activation in the anterior cingulate cortex.
D) The genuine painkiller inhibited activation in the anterior cingulate cortex, but the placebo activated the anterior cingulate cortex.