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
Beams can be used for cancer treatment are 
Select and explain. 
A. g-rays, B. a-rays, C. Neutrons, D. All
D: All
Answer: D: All 
Explanation: A i.e. Gamma rays; B i.e. a-rays; C i.e. Neutron