This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Time of Flight technique is employed in – 
Select and explain. 
A. Spiral CT, B. MR imaging, C. CT angiography, D. Digital radiography
B: MR imaging
Answer: B: MR imaging 
Explanation: 'Time of flight (TOF)' technique is employed in magnetic resonance angiography (MR angiography).