This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
In the RBC series, proliferation occurs at which stage? 
Select and explain. 
A. Early normoblast, B. Intermediate normoblast, C. Late normoblast, D. Proerythroblast
A: Early normoblast
Answer: A: Early normoblast 
Explanation: Proliferation occurs at early normoblast Ref : guyton and hall textbook of medical physiology 12 edition page number:111,112,113