This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
[{'content': 'Patient with a metallic foreign body in eye, which investigation is not done - \nSelect and explain. \nA. MRI, B. USG, C. X-ray, D. CT', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Absolute contraindications to MRI : cardiac pacemakers metallic foreign bodies cerebral aneurysmal clips implanted electrodes', 'role': 'assistant'}]