This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Density of cells in adult corneal endothelium - 
Select and explain. 
A. 2000 cells/mm2, B. 3000 cells/mm2, C. 4000 cells/mm2, D. 5000 cells/mm2
B: 3000 cells/mm2
Answer: B: 3000 cells/mm2 
Explanation: Endothelium consists of single layer of polygonal epithelial cells.The cell density of endothelium is around 3000 cells/mm2 Reference:Comprehensive Ophthalmology,AK Khurana,6th edition,pg no.96