This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'In RBC development, Haemoglobin first appears in \nSelect and explain. \nA. Basophilic erythroblast, B. Polychromatic erythroblast, C. Orthochromatic erythroblast, D. Reticulocyte', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Polychromatic/ Intermediate erythroblast is the stage where haemoglobin first appears in RBC development.', 'role': 'assistant'}]