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. Electrons pass near the nucleus of the anode, B. Energetic electron causes ejection of electron of anode, C. Any of the above, D. None of the above
C: Any of the above
Answer: C: Any of the above 
Explanation: None