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
Radium gives: 
Select and explain. 
A. a-rays, B. b rays and g rays, C. Kh-rays, D. All of the above
A: a-rays
Answer: A: a-rays 
Explanation: Ans. a-rays