Which of the following is an example of semi-critical instruments?

Semi-critical instruments are defined as those that come into contact with mucous membranes or non-intact skin, and therefore require a high level of disinfection. Among the provided options, instruments like otoscope specula, reusable earmolds or ear tips, and cerumen removal instruments fit this category since they directly interact with the ear canal or related areas. These instruments need to be thoroughly cleaned and disinfected between uses to minimize the risk of infection.

In contrast, disposable ear tips for insert earphones are single-use, eliminating the need for reprocessing, making them non-critical items. Personal protective equipment is more related to infection control for the wearer rather than being categorized based on their potential to transmit infections between patients. Touch surfaces, while they may harbor pathogens, are also considered non-critical because they do not come into direct contact with mucous membranes. Therefore, option A correctly identifies the items that are classified as semi-critical instruments in a hearing aid specialist practice.