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': 'For teletherapy setup, all are used except – \nSelect and explain. \nA. Iridium 127, B. Cobalt 60, C. Simulator, D. Computer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Iridium 192 is used in Brachytherapy (not in teletherapy).', 'role': 'assistant'}]