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 emits which of the following radiations: 
Select and explain. 
A. Alpha rays, B. Beta rays, C. Gamma rays, D. All
D: All
Answer: D: All 
Explanation: A i.e. a rays; B i.e. b-rays; C i.e. g -rays