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 produced when: 
Select and explain. 
A. Electron beam strike the nucleus of the atom, B. Electron beam strikes the anode, C. Electron beam reacts with the electromagnetic field., D. Electron beam strikes the cathode
B: Electron beam strikes the anode
Answer: B: Electron beam strikes the anode 
Explanation: B i.e. Electron beam strikes the anode