Which of the following is a symptom of heat stroke?

A symptom of heat stroke that stands out is dry skin. In heat stroke, the body's temperature regulation fails, which can lead to a cessation of sweating despite elevated body temperatures. This lack of sweating results in dry skin, distinguishing it from other heat-related illnesses such as heat exhaustion, where sweating is still present.

While rapid, weak pulse, nausea, and headache are symptoms commonly associated with heat-related illnesses, they can also occur in other conditions. Rapid, weak pulse might indicate various medical scenarios, but the presence of dry skin is particularly characteristic of heat stroke itself. This unique symptom underscores the seriousness of heat stroke, highlighting the need for immediate medical attention.