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: Pharmacology
The only FDA approved radioactive antibody that can be used for treatment of lymphoma : 
Select and explain. 
A. Trastuzumab, B. Ibritumomab, C. Rituximab, D. Imatinib
B: Ibritumomab
Answer: B: Ibritumomab 
Explanation: None