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': 'PET stands for - \nSelect and explain. \nA. Positive electron tomography, B. Proton-electron therapy, C. Positron emission tomography, D. Photon emitting tomography', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PET stands for positron emission tomography', 'role': 'assistant'}]