The consumption of glucose in active regions of the brain underlies the usefulness of a(n)

A) MRI.
B) brain lesion.
C) EEG.
D) PET scan.

PET scans use radioactive glucose to measure areas of activity in the brain. As active areas of the brain consume more glucose, they will have higher levels of radioactivity, allowing for visualization and analysis of brain activity. MRI and brain lesions do not directly measure brain activity, and EEG measures brain electrical activity, not glucose consumption.