<prompt> First cell of RBC development:ProerythroblastIntermediate normoblastReticulocyteBasophilic erythroblast  <response>: a. ProerythroblastRef: Nelsons 20e p 2304-2308, Ghai 8e p 330Stage of RBC development are: Proerythroblast - Basophillic - polychromatic - Orthochromatic erythroblast - Nucleated RBC - Reticulocyte - Mature RBC. 