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【单选题】
下列有关CD4和CD8分子的描述正确的是A.
CD8 分子可以与 MHC II 类分子结合，从而协助 TCR 识别抗原
B.
CD8 分子可以与MHC I类分子结合，从而协助TCR识别抗原
C.
CD4 分子可以与 MHC I 类分子结合，从而协助 TCR 识别抗原
D.
CD4 分子可以与 MHC II 类分子结合，从而协助 BCR 识别抗原
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