This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 1, Subject name: Radiology
[{'content': 'Which among the following is/are pure beta emitter(s) : \nSelect and explain. \nA. I-131, B. Samarium, C. Radium-226, D. Phosphorus-32', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pure Beta Emitters : Strontium-89 Phosphorus -32, Ytterium-90', 'role': 'assistant'}]