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
Isotopes used in relief of metastatic bone pain includes – a) Strontium–89b) I–131c) Gold–198d) P–32e) Rhenium–l86 
Select and explain. 
A. acd, B. ade, C. abd, D. ad
B: ade
Answer: B: ade 
Explanation: Radiopharmaceuticals (radioactive isotopes) used for metastatic bone pain are strantium (Sr"), Samarium (Sm153), Rhenium (Re186), Phosphorus (P32), and Tin (Sn117).
Some guides have included I-131 also as the answer, but Iodine-131 is not used for metastatic bone pain.