Which ailment is not related to the heart? A. Aneurysm B. Cardiomyopathy C. Diphtheria D. Myocardial rupture

Aneurysm (a bulge in an artery wall), cardiomyopathy (disease of the heart muscle) and myocardial rupture (a tear in the heart wall after a heart attack) relate to the heart and blood vessels. Diphtheria is a bacterial infection of the throat and nose, so it is not a heart ailment.