This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'Corneal endothelium is embryologically derived from \nSelect and explain. \nA. Neural crest, B. Ectoderm, C. Mesoderm, D. Endoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endothelium, Descemet&;s membrane, stroma and Bowman&;s layer are derived from the fibrous layer of mesenchyme lying anterior to the optic cup . The corneal endothelium is embryologically derived from the neural crest. The corneal endothelium is attached to the rest of the cornea through Descemet&;s membrane, which is an acellular layer composed mostly of collagen IV. Reference : A K KHURANA Comprehensive Ophthalmology edition 4,page-8', 'role': 'assistant'}]