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': 'Best way to know the position and integrity of ICD (implantable Cardioverter defibrillator) is \nSelect and explain. \nA. Plain radiograph, B. CT, C. MRI, D. PET', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Best way to know the position and integrity of ICD is to do a plain radiograph.', 'role': 'assistant'}]