This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
[{'content': 'Which of the following is not a neural crest derivative? \nSelect and explain. \nA. Ciliary muscle, B. Melanocytes, C. Ciliary ganglion, D. Sphincter pupillae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sphincter pupillae is derived from neurectoderm not mesenchyme or neural crest cell Neural Crest Derivatives: *Corneal Keratocytes *Ciliary muscles *Corneal stroma and endothelium (endothelial cells and keratocytes) *Pericytes of choroidal membranes *Melanocytes *Ciliary ganglion *Stroma of Iris and choroid Trabecular meshwork extraocular muscles are mesodermal in origin', 'role': 'assistant'}]