<prompt> Which of the following is the most common cause of subacute endocarditis?Staphylococcus aureusStaphylococcus epidermidisStreptococcus viridansStreptococcus pyogenes  <response>: Intraoral Streptococcus viridans is the most common cause of subacute endocarditis. Staphylococcus aureus is the most common cause of acute endocarditis. 