This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Hemoglobin first appears in \nSelect and explain. \nA. Early normoblasts, B. Intermediate normoblasts, C. Late normoblasts, D. Reticulocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hb synthesis sta in the stage of intermediate normoblast and then its content increase rapidlyRef: Medical Physiology Indu Khurana 2015 edition page No:106', 'role': 'assistant'}]