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
What is meant by PET scan ? 
Select and explain. 
A. Positive Emission Tomography, B. Positron Emission Tomography, C. Positron Energy Tomography, D. Positive Energy Tomography
B: Positron Emission Tomography
Answer: B: Positron Emission Tomography 
Explanation: PET stands for positron emission tomography