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: Anatomy
All are mesodermal origin, except: 
Select and explain. 
A. Sphincter pupillae, B. Cilary muscle, C. Iris, D. Ovarian tissue
A: Sphincter pupillae
Answer: A: Sphincter pupillae 
Explanation: A. i.e. Sphincter pupillae