This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
What happens to corneal endothelium after injury? 
Select and explain. 
A. Slowly regenerates, B. Regenerates rapidly, C. Never regenerates, D. Forms a scar
C: Never regenerates
Answer: C: Never regenerates 
Explanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 95 - 96)The cell density of endothelium is around 3000 cells/mm2 in young adults, which decreases with the advancing ageCorneal endothelium does not regenerate but adjacent cells slide to fill in a damaged area.Endothelium studied by specular microscope.