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-rays are modified 
Select and explain. 
A. Protons, B. Electrons, C. Neutrons, D. Positrons
B: Electrons
Answer: B: Electrons 
Explanation: X rays are the modified electrons from cathode striking the anode both are made up of tungsten which has a high melting point and low vapourisation pressure