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: Physiology
Reticulocvtes are stained with: March 2013 
Select and explain. 
A. Auramine, B. Brilliant cresyl blue, C. Sudan black, D. Indigo carmine
B: Brilliant cresyl blue
Answer: B: Brilliant cresyl blue 
Explanation: Ans. B i.e. Brillinat cresyl blueReticulocytesThey are immature RBCs that contain remnant cytoplasmic ribonucleic acid (RNA) and organelles such as mitochondria and ribosomes.Reticulocytes are visualized by staining with supravital stains (methylene blue or brilliant cresyl blue) that precipitate the RNA and organelles.These stains cause the ribosomal and residual RNA to coprecipitate with the few remaining mitochondria and ferritin masses in living young erythrocytes to form microscopically visible dark-blue clusters and filaments (reticulum).The reticulocyte count is a means of assessing the erythropoietic activity of the bone marrow.