Final answer:
Staphylococcus aureus is a bacterium commonly found on human skin and nasal passages, known for easily spreading in communal environments and able to develop into a more dangerous antibiotic-resistant form known as MRSA. he correct answer to the question is C.
Step-by-step explanation:
Staphylococcus aureus, often referred to as 'staph', is a bacterium that commonly resides in and on humans. It is found on the skin and in the nasal passages, with many people being chronic nasal carriers of the bacterium. Furthermore, Staphylococcus aureus can become particularly dangerous when it evolves into antibiotic-resistant strains, such as methicillin-resistant Staphylococcus aureus (MRSA). MRSA has become a concern due to its resistance to many commonly used antibiotics, including methicillin, amoxicillin, penicillin, and oxacillin.
These resistant strains, which can be classified as either hospital-acquired MRSA (HA-MRSA) or community-acquired MRSA (CA-MRSA), pose a significant risk to public health, especially in hospitals and other community settings where the risk of transmission is higher.