Which of the following statements best describes toxins?

Toxins are defined as poisonous substances produced by microorganisms, which can include bacteria, fungi, and other pathogens. These substances are often the result of the metabolic processes of these organisms and can cause disease through various mechanisms, such as damaging cells or interfering with normal biological functions in host organisms.

The nature of toxins is often harmful to living beings, distinguishing them from beneficial substances. Unlike the substances described in the other options, such as harmless chemicals or non-infectious agents, toxins have a direct adverse effect and are a significant concern in infection control practices within the field of barbering. Understanding the implications of exposure to toxins is crucial for maintaining safety and health standards.