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': 'Radioactive energy is released from? \nSelect and explain. \nA. Proton, B. Electron, C. Neutrons, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]