RNA remnants in RBCs can be visualized by which supravital stain?

The correct choice is associated with the use of New methylene blue, which is specifically designed to visualize RNA remnants in red blood cells (RBCs) during supravital staining. New methylene blue is a vital stain that can penetrate living cells, allowing for the examination of cellular components that may not be visible with conventional staining methods.

When red blood cells are exposed to New methylene blue, the stain highlights the presence of ribosomal RNA within the cells, which may present as a blue hue. This characteristic is particularly useful in identifying reticulocytes, the immature forms of RBCs that still contain RNA remnants.

Other staining methods listed, such as Giemsa stain, Romanowsky stain, and Wright's stain, are primarily used for differential staining of blood cells and do not specifically target rRNA. These stains might aid in visualizing overall morphology or the presence of other cellular components, but they lack the specificity necessary to clearly outline RNA remnants. Thus, New methylene blue stands out as the most effective choice for this particular application in hematology.