The Bacterial Species Staphylococus Aureus Is Found on the Skin

Multiple Choice

The bacterial species Staphylococus aureus is found on the skin and in the nasal passages of about 20% of the human population. In healthy individuals, S. aureus is benign (does not cause harm) in these locations. However, if it is introduced into the bloodstream through, for example, a wound, it can make a person gravely ill. Thus, the ecological relationship of S. aureus with a human:

A) can be mutualistic or antagonistic.
B) is always antagonistic.
C) is always mutualistic.
D) is fixed or unchanging.
E) is benign.