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
PET stands for - 
Select and explain. 
A. Positive electron tomography, B. Proton-electron therapy, C. Positron emission tomography, D. Photon emitting tomography
C: Positron emission tomography
Answer: C: Positron emission tomography 
Explanation: PET stands for positron emission tomography