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
[{'content': 'Density of cells in adult corneal endothelium is \nSelect and explain. \nA. 2000 cells/mm2, B. 3000 cells/mm2, C. 4000 cells/mm2, D. 5000 cells/mm2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 95 - 96)The cell density of corneal endothelium is around 3000 cells/mm2 in young adults, which decreases with the advancing age', 'role': 'assistant'}]