A 10-year-old child with short stature pallor, multiple petechiae, and hypoplastic thumb has HB of 7 g %, normal reticulocyte count (1%), hematocrit 25%, and absolute neutrophil count 200/cu mm. The most likely diagnosis is
Fanconi's anemia HIV bone morrow infection Hypersplenism induced bicytopenia Parvovirus B virus infection with transient erythro- blastopenia of childhood