This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Cornea, Subject name: Ophthalmology
Which dye is best used for defining corneal erosions and ulcers? 
Select and explain. 
A. Lissamine green, B. Indocyanine green, C. Rose Bengal, D. Fluorescein
D: Fluorescein
Answer: D: Fluorescein 
Explanation: 1.Fluorescein - fluorescein impregnated strips used Uses Corneal staining to detect abrasion and ulcers. Lacrimal tests includes tear film break up time , Jane's test for watering eye. Seidel's Test. To detect leakage of aqueous from AC 2. Lissamine green stains degenerated and dead cells -used in ocular surface disorders -Eg keratoconjunctivitis 3. Indocyanin green (lCG) has a high protein binding capacity Used in Fundus angiography - for disorders involving choroidal vasculature ICG-enhanced anterior/posterior capsulorrhexis - childhood/adult cataract with no fundus glow. 4. Rose bengal(1%) is used for staining of margins of dendritic ulcers