This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Positron Emission Tomography of Non-Oncological Disorders, Subject name: Radiology
PET scan uses which tracer material? 
Select and explain. 
A. FDG, B. CDF, C. ADP, D. MIBG
A: FDG
Answer: A: FDG 
Explanation: ANSWER: (A) FDGREF: Sutton's Radiology, 7th edition, page 1826"Currently the mainstay of clinical PET is deoxyglucose labelled with fluorine-18 (5FDG)"