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
Radioactive energy is released from? 
Select and explain. 
A. Proton, B. Electron, C. Neutrons, D. All
D: All
Answer: D: All 
Explanation: All REF: Vasudevan sree kumari 3/e p. 402, CSDT 10th e p. 1256 Rays used in radiotherapy/Radiodiagnosis are of two broad types as per linear energy transfer (LET) Low LET High LET x-rays a paicles y-rays Neutrons /3-rays Protons electrons Heavy ions