This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
SPECT Stands for 
Select and explain. 
A. Single Proton Emission Computed Tomography, B. Single Positron Emission Computed Tomography, C. Single Photon Emission Computed Tomography, D. Single Positive Emission Computed Tomography
C: Single Photon Emission Computed Tomography
Answer: C: Single Photon Emission Computed Tomography 
Explanation: SPECT stands for Single Photon Emission Computed Tomography, It uses a 360 degree revolving Gamma Camera and Acquires 3D images using Tc99m labelled radioisotopes like HMPAO (Hexamethylpropyleneamine oxime).