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
Which of the following is feature of reticulocyte? 
Select and explain. 
A. Constitute 10% of the red cells, B. No nucleus, C. Smaller in the size than RBCs, D. Mature in lymph nodes
B: No nucleus
Answer: B: No nucleus 
Explanation: 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.