What are the four high-risk cardiac conditions considered for antibiotic prophylaxis?
a) Mitral valve prolapse, hypertension, atrial fibrillation, myocardial infarction
b) Artificial heart valves, previous endocarditis, congenital heart disease, cardiac transplant
c) Atrial flutter, coronary artery disease, dilated cardiomyopathy, pericarditis
d) Hypertrophic cardiomyopathy, arrhythmias, aortic stenosis, myocarditis