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': "Advantage of brachytherapy – a) Non-invasiveb) Less radiation hazard to normal tissuec) Max.radiation to diseased tissued) Can be given in all malignanciese) Doesn't require trained personnel \nSelect and explain. \nA. a, B. c, C. ac, D. bc", 'role': 'user'}, {'content': 'Answer: D \nExplanation: As the radiotherapy source is placed directly in contact with tumor, maximum radiation exposure occurs to tumor tissue with relative sparing of adjacent normal tissue.\nBrachytherapy is invasive and requires trained personnel.\nBrachytherapy can be used in most (not all) of the malignancies where radiotherapy is the component of treatment.', 'role': 'assistant'}]