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
[{'content': 'In the RBC series, proliferation occurs at which stage? \nSelect and explain. \nA. Early normoblast, B. Intermediate normoblast, C. Late normoblast, D. Proerythroblast', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Proliferation occurs at early normoblast Ref : guyton and hall textbook of medical physiology 12 edition page number:111,112,113', 'role': 'assistant'}]