This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
Corneal endothelium is derived from: 
Select and explain. 
A. Neuroectoderm, B. Neural crest cells, C. Mesoderm, D. Surface ectoderm
B: Neural crest cells
Answer: B: Neural crest cells 
Explanation: SURFACE ECTODERM - LENS- Epithelium of the all structures except ciliary body & iris- Glands NEURAL ECTODERM - Epithelium of ciliary body & iris- Retinal pigment epithelium- Optic nerve- Sphincter and dilator pupillae muscles - Smooth muscles of iris MESODERM - EXTRAOCULAR MUSCLES- Endothelium of all the orbit & stroma of iris & ciliary body- Sclera (temporal pa) NEURAL CREST - Stroma of cornea & choroid - Corneal endothelium - Sclera (except temporal pa) -Melanocytes -Corneal keratocytes -Ciliary muscles -Ciliary ganglion -Stroma of iris -Choroid Trabecular meshwork