Final answer:
MRI examination cannot be performed on a patient with a cardiac pacemaker.
Step-by-step explanation:
Out of the given options, the examination that cannot be performed on a patient with a cardiac pacemaker is MRI (Magnetic Resonance Imaging). MRI uses strong magnetic fields and radio waves to produce detailed images of the body, including the organs and tissues. However, the presence of a pacemaker can interfere with the magnetic field and cause malfunction or damage to the device. Therefore, patients with pacemakers are advised not to undergo MRI examinations.