This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Sphincter and dilator pupillae develops from \nSelect and explain. \nA. Neuroectoderm, B. Surface ectoderm, C. Mesoderm, D. Endoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HUMAN EMBRYOLOGY-INDERBIR SINGH tenth edition Derivatives of neuroectoderm: R-Retina O-Optic stalk/optic nerve M-Muscles of iris(sphicter and dilator pupillae) E-Epithelium of iris/ciliary body', 'role': 'assistant'}]