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
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: Ans. is 'b' i.e., 3000 cells/mm2 The cell density of corneal endothelium is around 3000 cells/mm2 in young adults, which decreases with the advancing age.