This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Magnetic Resonance Imaging, Subject name: Radiology
Which MRI sequence is called as Tractography? 
Select and explain. 
A. DWI, B. SWI, C. DTI, D. FLAIR
C: DTI
Answer: C: DTI 
Explanation: Tractography: Is a 3D modelling technique used to visually represent nerve tracts using data collected by Diffusion Tensor Imaging. It uses special techniques of magnetic resonance imaging (MRI) and computer-based diffusion tensor imaging.