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
X-ray Artifact is 
Select and explain. 
A. A radiolucent area, B. Any abnormal opacity in the radiograph, C. Produced when patient moves while taking the shoot, D. All of the above
C: Produced when patient moves while taking the shoot
Answer: C: Produced when patient moves while taking the shoot 
Explanation: X-ray artifacts. Artifacts can present in a variety of ways including abnormal shadow noted on a radiograph or degraded image quality and have been produced by artificial means from hardware failure, operator error and software (post-processing) artifacts.