This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Sphincter and dilator pupillae muscles are derived embryologically from the: 
Select and explain. 
A. Surface ectoderm, B. Mesoderm, C. Neuroectoderm, D. All of the above
C: Neuroectoderm
Answer: C: Neuroectoderm 
Explanation: Ans. Neuroectoderm