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
In radiation the rays used are – 
Select and explain. 
A. α,β, B. α,γ, C. β, γ, D. β, γ,α
D: β, γ,α
Answer: D: β, γ,α 
Explanation: None