What statement about phenolic disinfectants is true?

Phenolic disinfectants are indeed a form of phenol, which is a chemical compound that can have various modifications and derivatives. While they are not exactly formaldehyde, they belong to a class of chemicals that can exhibit a similar level of antimicrobial activity, making them effective in disinfection. These disinfectants are commonly used in a variety of environments, including medical settings, due to their ability to kill a wide range of pathogens, including bacteria, viruses, and fungi.

The strength of phenolic disinfectants is that they are particularly good at penetrating organic matter, which makes them effective even in less-than-ideal conditions. This penetrative ability adds to their efficacy against microorganisms, making them a valuable tool for maintaining sanitary environments.

In contrast, other options do not align with the characteristics of phenolic disinfectants. They are not harmless; they can be quite harsh and potentially irritating to skin and tissues. They are also typically not used directly on skin, as this can cause adverse reactions. Lastly, they have a proven track record of effectiveness against bacteria, which contradicts any assertion that they are ineffective in this regard.