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': 'Corneal endothelium is embryologically derived from the following structure: \nSelect and explain. \nA. Neural crest, B. Ectoderm, C. Mesoderm, D. Endoderm', 'role': 'user'}, {'content': "Answer: A \nExplanation: Derivatives of neural crest in eye: Corneal stroma, keratocytes and endothelium Sclera Trabecular meshwork endothelium Iris stroma Ciliary muscles Choroidal stroma Pa of the vitreous Uveal and conjunctival melanocytes Meningeal sheaths of the optic nerve Ciliary ganglion Orbital bones Orbital connective tissue Connective tissue sheath and muscular layer of the ocular and orbital vessels Ref: Parsons' Diseases of the Eye By Ramanjit Sihota & Radhika Tandon, 21st edition, Page 5.", 'role': 'assistant'}]