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 ocular structures is the most radiosensitive: \nSelect and explain. \nA. Lens, B. Cornea, C. Retina, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. All', 'role': 'assistant'}]