This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunomodulators, Subject name: Pharmacology
[{'content': 'Which of the following is a Radioactive anti-cancer Monoclonal antibody? \nSelect and explain. \nA. Basiliximab, B. Bevacizumab, C. Ibritumomab, D. Rituximab', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ibritumomab and Tositumomab are anti-cancer Monoclonal antibodies attached to yttrium radioisotope.Ref: Sharma and Sharma 3rd ed/pg 876', 'role': 'assistant'}]