This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Radiology, Subject name: Radiology
[{'content': 'All the following statements are true except? \nSelect and explain. \nA. X-Rays are extranuclear in origin., B. Gamma Rays are intranuclear in origin., C. Ultrasound uses a type of Electromagnetic radiation., D. Velocity of X-Rays is equal to the velocity of light.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *Ultrasound waves are sound waves,not electromagnetic waves. *Ultrasound waves travel with a velocity of 1540m/s in human tissues. *All Electromagnetic radiations like X rays,Gamma Rays,Infrared waves travel with the same velocity i.e. the velocity of speed of light 3 x108m/s. *Wavelength of Xrays is 0.1-100 Angstrom.', 'role': 'assistant'}]