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
Which among the following is/are pure beta emitter(s) : 
Select and explain. 
A. I-131, B. Samarium, C. Radium-226, D. Phosphorus-32
D: Phosphorus-32
Answer: D: Phosphorus-32 
Explanation: Pure Beta Emitters : Strontium-89 Phosphorus -32, Ytterium-90