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
Slip ring technology is used in 
Select and explain. 
A. First generation CT, B. Ultrasound, C. MRI, D. Spiral CT
D: Spiral CT
Answer: D: Spiral CT 
Explanation: A Slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power.