This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Trauma, Subject name: Ophthalmology
[{'content': 'Investigation of choice for Intraocular foreign body is - \nSelect and explain. \nA. CT Scan, B. MRI, C. USG, D. X-ray', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CT Scan o Computed tomography provides much more reliable information regarding the size, shape, and localization of the foreign body.o MRI generally is not used in metallic IOFB. MRI may be more effective in localizing nonmetallic IOFB such as woodo Ultrasound can be a useful adjunct in localizing IOFB and to determine if the object is metallic. Ultrasound could be performed carefully in case of an open globe injury.'", 'role': 'assistant'}]