This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
Crystalline lens is derived embryologically from the 
Select and explain. 
A. Surface ectoderm, B. Neuroectoderm, C. Surface ectoderm and mesoderm, D. Neuroectoderm and mesoderm
A: Surface ectoderm
Answer: A: Surface ectoderm 
Explanation: FORMATION OF LENS VESICLE The optic vesicle grows laterally and comes in contact with the surface ectoderm. The surface ectoderm, overlying the optic vesicle becomes thickened to form the lens placode which sinks below the surface and is conveed into the lens vesicle. It is soon separated from the surface ectoderm at 33rd day of gestation. Image : Embryonic Development of the Human Lens Reference :- A K KHURANA; pg num:- 06