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
[{'content': 'All are mesodermal origin, except: \nSelect and explain. \nA. Sphincter pupillae, B. Cilary muscle, C. Iris, D. Ovarian tissue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Sphincter pupillae', 'role': 'assistant'}]