This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
[{'content': '18-FDG stands for: \nSelect and explain. \nA. 18-FI uorodeoxy glucose, B. 18-Fluorodioxy glucose, C. 18-Fluorodeoxy galactose, D. 18-Fluorodioxy galactose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A (18-FIuorodeoxy...) POSITRON EMISSION TOMOGRAPHY (PET) L & B 25th/ 136-37# PET is an extension of nuclear medicine, in which a positron-emitting substance such as 18F is tagged and used to assess tissue metabolic characteristics.# Nuclear medicine also differs from other means of imaging, which are largely anatomically based, as it also provides functional information.# The most commonly used radiolabelled tracer is 18F-2- fluara-2-deoxy-D-ghicose (FDG), although other tracers can also be used in order to assess metabolic functions such as oxygen and glucose consumption and blood flow.', 'role': 'assistant'}]