This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Attachment of Ebstein Barr virus in nasopharynx is mediated through: \nSelect and explain. \nA. CD 4, B. CD 3, C. CD 8, D. CD 21', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. CD 21Attachment of Ebstein Barr virus in nasopharynx is mediated through CD 21 or CR 2 on B lymphocytes. This is also a receptor for C3b.', 'role': 'assistant'}]