This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: dermatology and infectious disease, Subject name: Pathology
[{'content': 'EBV infects B cells binding to \nSelect and explain. \nA. CD 21, B. CD 40, C. CD 79a, D. CD 23', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CD21- EBV uses this receptor to bind and infect B cellsReference: Robbins; 9th edition; Volume I; Page no: 327', 'role': 'assistant'}]