This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'PET scan uses – \nSelect and explain. \nA. 2–Fluorodeoxyglucose, B. Technetium, C. Chromium, D. Cobalt', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fluorodeoxyglucose is a radiopharmaceutical used in medical imaging modality positron emission tomography (PET).', 'role': 'assistant'}]