<prompt> CD4 is associated with HLA?HLA 1HLA 2HLA 3All of them  <response>: Ans. is b i.e., HLA 2 MHC-II recognizes exogenous antigen extracellular microbes, soluble proteins and present it to CD4 helper T cells MHC-II restricted. MHC class I present antigen to cytotoxic CD-8 T cells MHC-I restricted. 