HIV infects most commonly

Ans. is 'a' i.e CD4+ helper cells CD4+ T lymphocytes and CD4+ cells of monocyte lineage are the principal targets of HIV.Virtually any cell that expresses the CD4+molecule together with Coreceptor molecules can potentially be infected with H.I.V. e.g.Dendritic cellsLangerhans cellsEven Megakaryocytes, eosinophilis, Astrocytes, oligodendrocytes, microglial cells, CD4+ T cells can also be infected with HIV.