This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': 'Remote after loading is used in \nSelect and explain. \nA. Brachytherapy, B. proton beam, C. Electron beam, D. Cyberknife therapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : david sutton 9th ed', 'role': 'assistant'}]