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
[{'content': 'Structure commonly involved in sympathetic ophthalmia: March 2007 \nSelect and explain. \nA. Cornea, B. Lens, C. Optic nerve, D. Iris and ciliary body', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Iris & Ciliary body', 'role': 'assistant'}]