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
CAT was invented by– 
Select and explain. 
A. Hounsfield, B. Roentgen, C. Cormack, D. Tesla
A: Hounsfield
Answer: A: Hounsfield 
Explanation: A new method of forming images from X-rays (i.e. CT/CAT) was developed and introduced into clinical use by a British physicist Godfrey Hounsfield in 1972.