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 formed when electrons hit: 
Select and explain. 
A. Water, B. Anode, C. Radium source, D. None of the above
B: Anode
Answer: B: Anode 
Explanation: Ans. Anode