This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Circulus iridis major is seen at \nSelect and explain. \nA. Ciliary body, B. Pupillary margin, C. Collarette, D. Root of iris', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anterior ciliary aeries join with 2 long posterior ciliary aeries at root of iris', 'role': 'assistant'}]