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
Corneal ulcer is defined as 
Select and explain. 
A. Erosion of epithelium only, B. Erosion of endothelium only, C. Erosion of epithelium + underlying inflammation, D. Loss of endothelium with loss of corneal sensation
C: Erosion of epithelium + underlying inflammation
Answer: C: Erosion of epithelium + underlying inflammation 
Explanation: 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