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
Which of the following is a Radioactive anti-cancer Monoclonal antibody? 
Select and explain. 
A. Basiliximab, B. Bevacizumab, C. Ibritumomab, D. Rituximab
C: Ibritumomab
Answer: C: Ibritumomab 
Explanation: Ibritumomab and Tositumomab are anti-cancer Monoclonal antibodies attached to yttrium radioisotope.Ref: Sharma and Sharma 3rd ed/pg 876