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
[{'content': 'Radium gives: \nSelect and explain. \nA. a-rays, B. b rays and g rays, C. Kh-rays, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a-rays', 'role': 'assistant'}]