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': 'Which of the following statements regarding corneal transplantation is true \nSelect and explain. \nA. Whole eye needs to be preserved in tissue culture, B. Donor not accepted if age > 60 years, C. Specular microsocopy analysis is used to assess endothelial cell count, D. HLA matching is mandatory', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Specular microsocopy analysis is used to assess endothelial cell count Donor cornea is most commonly preserved as corneal scleral button (cornea with 2-3 mm sclera/ rim)Q. HLA matching is not mandatoryQ. Cornea from donors between 5-60/70 years age are preferred but the age limits at both ends are arbitraryQ. Specular microscopy >Slit lamp examination are most impoant quality control evaluation used to assess endothelial cell count of donor corneaQ.', 'role': 'assistant'}]