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: Radiology
[{'content': 'A Pt. is presented with a metallic foreign body in the eye. Which investigation should not be done: \nSelect and explain. \nA. USG, B. X-ray, C. CT, D. MRI', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]