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
[{'content': 'PET scan uses which tracer material? \nSelect and explain. \nA. FDG, B. CDF, C. ADP, D. MIBG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) FDGREF: Sutton\'s Radiology, 7th edition, page 1826"Currently the mainstay of clinical PET is deoxyglucose labelled with fluorine-18 (5FDG)"', 'role': 'assistant'}]