This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
True about X-rays: 
Select and explain. 
A. Differ from light in their charge, B. Are produced when Electron beam strikes the Cathode, C. Bone scan makes use of high-energy X-rays., D. Can be emitted as well as absorbed.
D: Can be emitted as well as absorbed.
Answer: D: Can be emitted as well as absorbed. 
Explanation: Ans. D. Can be emitted as well as absorbedX-rays are ionizing electromagnetic radiations, essentially produced when a stream of K shell electrons of an atom accelerated by a high voltage applied between the filament (cathode) and the target (anode), strikes the target and the electrons give up their energy producing characteristic radiations i.e., the X-rays. X-rays have dual property - they can be emitted as well as absorbed. In bone scan gamma radiations are used (not x-rays).