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
An absolute contraindication of MRI is - 
Select and explain. 
A. Pacemaker, B. Prosthetic cardiac valves, C. Insulin pump, D. Choclear implants
A: Pacemaker
Answer: A: Pacemaker 
Explanation: Cardiac pacemakers are the absolute contraindications of MRI. Also rememeber : Other absolute contraindications : metallic foreign bodies cerebral aneurysmal clips implanted electrodes