Samuel is going to the dentist for some work and must take endocarditis prophylaxis because of his history of:

Samuel is going to the dentist for some work and must take endocarditis prophylaxis because of his history of:

a. Severe asthma.
b. A common valvular lesion.
c. Severe hypertension.
d. A previous coronary artery bypass graft (CABG).