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
[{'content': 'Normal endothelial cell count in Corneal endothelium is \nSelect and explain. \nA. 500-1000 cells / sq.mm, B. 1500-2000 cells / sq.mm, C. 2000-2500 cells / sq.mm, D. 2500-3000 cells / sq.mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Normal endothelial cell count in Corneal endothelium is 2500-3000 cells / sq.mm', 'role': 'assistant'}]