Question

which substance is processed less efficiently by cocaine addicts, according to pet scan results?
carbohydrates
glucose
protein
sucrose

Explanation:

PET scans measure glucose metabolism in the brain. Cocaine addicts show reduced glucose metabolism in certain brain regions, indicating less efficient processing of glucose. Carbohydrates are a broader category (glucose is a simple carbohydrate), protein is for building/repairing tissues, and sucrose is a disaccharide (not the focus of PET - related inefficiency in this context).

Answer:

glucose