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': 'Ofatumumab is a monoclonal antibody against : \nSelect and explain. \nA. CD19, B. CD79a, C. CD20, D. CD25', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ofatumumab is a monoclonal antibody against CD20 used in the treatment of SLE.', 'role': 'assistant'}]