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 develop from \nSelect and explain. \nA. Mesoderm, B. Surface ectoderm, C. Neuroectoderm, D. Endoderm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Muscles of the iris (sphincter and dilator papillae) and myoepithelial cells of the sweat glands are derived from ectoderm.Ref: Human Embryology; Inderbir Singh; Tenth edition; Page no:113', 'role': 'assistant'}]