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: Ophthalmology
Fluorescein dye is used to stain 
Select and explain. 
A. Disease and devitalized cells, B. Areas of denuded epithelium, C. Mucus, D. All of the above
B: Areas of denuded epithelium
Answer: B: Areas of denuded epithelium 
Explanation: Fluorescein dye is used to stain areas of denuded epithelium.
Rose Bengal stains disease and devitalized cells.
Alcian Blue stains the mucus.