This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Subject name: Ophthalmology
[{'content': 'Smooth muscle of the IRIS is developed from- \nSelect and explain. \nA. Surface Ectoderm, B. Mesoderm, C. Neural Crest, D. Neural Ectoderm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans- D. Neuroectoderm forms iris muscles. Mesoderm gives rise to blood vessels and choroid Sphicter papillae and dilator papillae are smooth muscles of iris which are developed from neuroectoderm. Sphincter papillae - a circular bundle of smooth muscles running around the pupillary margin- causes constriction of the pupil. Dilator papillae- arranged radically near the root of the iris,causes dilation of the pupil.', 'role': 'assistant'}]