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': 'Which of the following is called as dangerous zone of eye: \nSelect and explain. \nA. Sclera, B. Retina, C. Optic nerve, D. Ciliary body', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ciliary body', 'role': 'assistant'}]