<prompt> Corneal ulcer is defined asErosion of epithelium onlyErosion of endothelium onlyErosion of epithelium underlying inflammationLoss of endothelium with loss of corneal sensation  <response>: Answer- C. Erosion of epithelium underlying inflammationCorneal ulcer refers to discontinuation in normal epithelial surface of cornea associated with necrosis of the surrounding corneal tissue 