Safety Trained Supervisor in Construction (STSC) Practice Exam 2026 - Free STSC Practice Questions and Study Guide

To understand why the answer is substitution, gloves, barrier cream, consider the hierarchy of controls used in occupational health and safety.

Substitution is the most effective control measure because it involves replacing a hazardous material with a safer alternative. By eliminating the source of potential dermatitis—such as harsh chemicals or irritants—you drastically reduce the risk of skin exposure and subsequent health issues. This proactive approach eliminates the problem at its source, making it the first line of defense.

Following substitution, using gloves is a critical protective measure. They act as a physical barrier between the skin and harmful substances, significantly reducing direct contact and preventing irritants from causing dermatitis. However, this method is a secondary intervention and relies on the correct selection, fit, and use of gloves to ensure their effectiveness.

Barrier creams, while helpful, are the least effective of the three when considering long-term prevention. These creams create a protective layer on the skin, which can help minimize contact with irritants. However, they do not replace the need for effective control measures like substitution and proper protective equipment such as gloves, as they may provide a false sense of security.

This order highlights the importance of focusing on reducing or eliminating hazards as the most effective intervention, followed by using protective equipment and personal care products