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': 'Lens develops from: September 2012 \nSelect and explain. \nA. Neural crest, B. Mesoderm, C. Neuroectoderm, D. Surface ectoderm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Surface ectoderm Embryology of eyeball Structures derived from mesoderm: Corneal stroma & endothelium, Only smooth muscles of iris, All muscles (EXCEPT iris muscle) Structures derived from surface ectoderm: Conjunctival epithelium, Lens Structures derived from neuroectoderm: Epithelium of iris & ciliary body, Muscles of iris (constrictor & dilator pupillae)', 'role': 'assistant'}]