This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
First cell of RBC development: 
Select and explain. 
A. Proerythroblast, B. Intermediate normoblast, C. Reticulocyte, D. Basophilic erythroblast
A: Proerythroblast
Answer: A: Proerythroblast 
Explanation: a. Proerythroblast(Ref: Nelson's 20/e p 2304-2308, Ghai 8/e p 330)Stage of RBC development are: Proerythroblast - Basophillic - polychromatic - Orthochromatic erythroblast - Nucleated RBC - Reticulocyte - Mature RBC.