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
Sphincter and dilator pupillae develops from 
Select and explain. 
A. Neuroectoderm, B. Surface ectoderm, C. Mesoderm, D. Endoderm
A: Neuroectoderm
Answer: A: Neuroectoderm 
Explanation: 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