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
Corneal epithelium is embryologically derived from: 
Select and explain. 
A. Neural crest, B. Ectoderm, C. Mesoderm, D. Endoderm
B: Ectoderm
Answer: B: Ectoderm 
Explanation: Ectoderm