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': 'Definitive or secondary vitreous is embryologically derived mostly from: \nSelect and explain. \nA. Neuroectoderm, B. Mesoderm, C. Surface ectoderm, D. Surface ectoderm and mesoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Neuroectoderm', 'role': 'assistant'}]