<prompt> CD4 lymphocytes helper cells recognize -HLA class I antigenHLA class II antigenHLA class III antigenNone of the above  <response>: Class II MHC antigens have single locus as HLA-D. - these antigens have fuher 3 loci: DR, DQ, and DP. Class II MHC is identified by B cells and CD4 cells. T helper cells. ReReference:arsh mohan textbook pathology, 7th edition, pg no:49 p 