Final answer:
An antiseptic would be used on the skin surface (A). These are suitable for living tissues and commonly used to prevent infections during medical procedures.
Step-by-step explanation:
On which of the following would an antiseptic be used? The correct answer is A. skin surface. Antiseptics are antimicrobial substances that are applied to living tissues/skin to reduce the possibility of infection, sepsis, or putrefaction. They are different from disinfectants, which are used on non-living objects. An example of an antiseptic is Betadine, a solution of the iodophor povidone-iodine, which is commonly used as a topical antiseptic on a patient's skin before incision during surgery.
Antiseptics are suitable for use on tissues for microbial control to prevent infection. An example of a convenient route for home administration of an antimicrobial to treat a systemic infection would be oral administration. Soil is recognized for yielding compounds with significant antimicrobial activity, surpassing other sources such as water, air, and volcanoes. Long-term use of broad-spectrum antimicrobials can contribute to the development of a superinfection due to the suppression of normal flora.