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
Production of X-ray is mainly contributed by: 
Select and explain. 
A. Brehmstalung radiation., B. Characteristic radiation., C. Both., D. None.
A: Brehmstalung radiation.
Answer: A: Brehmstalung radiation. 
Explanation: Production of X-Ray