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: Microbiology
[{'content': 'CD4 cells recognize the antigens in association with \nSelect and explain. \nA. MHC I, B. MHC II, C. MHC III, D. B-cell receptor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]