Impetigo Can Be Caused by Either Staphylococcus Aureus or Streptococcus

Impetigo can be caused by either Staphylococcus aureus or Streptococcus pyogenes. Culture- based identification of the causative organism can be complicated by _______.

A) their common optimal growth temperature, 37°C
B) the fastidious nature of both organisms
C) the ability of S. aureus to kill S. pyogenes
D) the common surface antigens of these two organisms