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
Who discovered X-rays: September 2007 
Select and explain. 
A. Roentgen, B. Curie, C. Becquerel, D. Gray
A: Roentgen
Answer: A: Roentgen 
Explanation: Ans. A: Roentgen X-rays were produced firstly in 1895 by Roentgen.