Which of the following is NOT regulated by OSHA?

The correct answer is based on the scope and mandate of OSHA, which stands for the Occupational Safety and Health Administration. OSHA is primarily concerned with ensuring safe and healthful working conditions for employees by setting and enforcing standards and providing training and outreach.

OSHA's regulations cover various aspects of workplace safety, including establishing standards for workplace safety, requirements for handling hazardous materials, and the provision of necessary training programs related to safety and health compliance. These areas are essential components of ensuring workplace safety and are thus regulated by OSHA.

However, the evaluation of skilled and competent services does not fall under OSHA's jurisdiction. While ensuring competence in certain skills is important, it typically pertains more to licensing and certification standards governed by other agencies or boards related to specific professions. These evaluations are often carried out by respective professional boards, like those for cosmetology or nursing, rather than OSHA, which focuses strictly on safety and health regulations. Therefore, the evaluation of skilled and competent services is not something that OSHA regulates.