This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematopoeisis: Basic concepts, Subject name: Pathology
[{'content': 'Which of the following is feature of reticulocyte? \nSelect and explain. \nA. Constitute 10% of the red cells, B. No nucleus, C. Smaller in the size than RBCs, D. Mature in lymph nodes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reticulocytes are non-nucleated spherical cells bigger than normal RBCs and are polychromatic (having a blue color) d/t the presence of free ribosomes & RNA. They are identified with supravital staining. Best stain to identify them is new methylene blue.', 'role': 'assistant'}]