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': 'Anti CD20 is \nSelect and explain. \nA. Alemtuzumab, B. Bevacizumab, C. Gemtuzumab, D. Tositumomab', 'role': 'user'}, {'content': 'Answer: D \nExplanation: anti cd20 mabs: KD Tripathi 8th ed', 'role': 'assistant'}]