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
CT scan was invented by: 
Select and explain. 
A. Geoffrey Hounsfield, B. Eric Storz, C. lohn Snow, D. Takashita Koba
A: Geoffrey Hounsfield
Answer: A: Geoffrey Hounsfield 
Explanation: Geoffrey Hounsfield