This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
Wavelength of x- rays? 
Select and explain. 
A. 1 to 10 nm, B. 0.1 to 10 nm, C. 0.01 to 10 nm, D. 0.001 to 10 nm
C: 0.01 to 10 nm
Answer: C: 0.01 to 10 nm 
Explanation: Wavelength of X-rays is 0.1 - 100Ao or 0.01nm - 10 nm (in electromagnetic spectrum) Velocity of X-rays is equal to the Speed of Light. They are found to reside between ultraviolet radiation and gamma rays on the electromagnetic spectrum.