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
Best way to know the position and integrity of ICD (implantable Cardioverter defibrillator) is 
Select and explain. 
A. Plain radiograph, B. CT, C. MRI, D. PET
A: Plain radiograph
Answer: A: Plain radiograph 
Explanation: Best way to know the position and integrity of ICD is to do a plain radiograph.