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': 'Best method of detection of retained glass intraocular foreign body is \nSelect and explain. \nA. Radiography, B. Usg, C. Tonometry, D. CT scan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In CT or MRI, accurate foreign body localization is possible.', 'role': 'assistant'}]