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: Anatomy
Optic vesicle is derived from ? 
Select and explain. 
A. Neuroectoderm, B. Surface ectoderm, C. Endoderm, D. Mesoderum
A: Neuroectoderm
Answer: A: Neuroectoderm 
Explanation: Ans. is'a'i.e., Neuroectoderm(Ref Indo Khurana ernbryology p. 268)Formation of optic cupAn outgrowth from prosencephalon forms optic vesicle (neuroectodermal structure).Proximal pa of optic vesicle becomes constricted and elongated to form optic stalk.