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
Definitive or secondary vitreous is embryologically derived mostly from: 
Select and explain. 
A. Neuroectoderm, B. Mesoderm, C. Surface ectoderm, D. Surface ectoderm and mesoderm
A: Neuroectoderm
Answer: A: Neuroectoderm 
Explanation: Ans. Neuroectoderm