Which of the following is considered a restraint?

A restraint is defined as any method that restricts a person's movement or ability to freely engage in activities. In this context, clothing a client cannot take off is considered a restraint because it restricts their ability to remove the clothing if needed. This can impede a client's autonomy and may violate their rights if it is used without clear justification or consent.

In contrast, other options involve supportive tools that assist with comfort and safety without intentionally restricting freedom. For example, a pillow used to position a client aids in comfort and proper alignment but does not inhibit their movement. A medication for pain relief helps manage discomfort and supports overall well-being without physical restriction. A supportive chair is designed to provide stability and comfort while allowing the client to maintain some degree of freedom in their positioning. Therefore, the key factor that distinguishes the correct answer is the element of restraint placed on the client's personal agency.