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
Anti CD20 is 
Select and explain. 
A. Alemtuzumab, B. Bevacizumab, C. Gemtuzumab, D. Tositumomab
D: Tositumomab
Answer: D: Tositumomab 
Explanation: anti cd20 mabs: KD Tripathi 8th ed