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
Slice of tissue X-rays is - 
Select and explain. 
A. Tomography, B. Mammography, C. Contrast studies, D. All of the above
A: Tomography
Answer: A: Tomography 
Explanation: In CT, X-rays are used to create axial slices (sections) of the body -

               Slices with exposure to radiation → CT
               Slices without exposure to radiation → MRI