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
[{'content': 'The only FDA approved radioactive antibody that can be used for treatment of lymphoma : \nSelect and explain. \nA. Trastuzumab, B. Ibritumomab, C. Rituximab, D. Imatinib', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]