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': 'Radiation emitts by Ir-192: \nSelect and explain. \nA. 0.5 Mev, B. 0.6 Mev, C. 0.66 Mev, D. 0.47 Mev', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. 0.47 Mev', 'role': 'assistant'}]