Final answer:
The correct answer to the question is Antiseptic. Antiseptics are safe for use on living tissues to reduce pathogens, compared to disinfectants that are used on inanimate objects. Phenol is a traditional standard for comparing the effectiveness of disinfectants.
Step-by-step explanation:
A product that can be applied to the skin to reduce pathogens is called an antiseptic. Unlike disinfectants, which are suitable for inanimate surfaces, antiseptics are antimicrobial substances safe for use on living tissues.
Antibiotics and sterilants, on the other hand, serve different purposes; antibiotics are used to treat infections internally, and sterilants are used to achieve sterility by killing or removing all forms of microbial life including spores.
Therefore, the correct answer is:
A. Antiseptic
Antiseptics, such as hydrogen peroxide and isopropyl alcohol, must be selectively effective against microorganisms and able to penetrate tissue deeply without causing damage. Phenol is historically used as a standard for comparing the effectiveness of disinfectants, a practice dating back to the surgeon Joseph Lister's antiseptic surgery techniques.