Which of the following is NOT a sign of heat exhaustion?

In cases of heat exhaustion, one of the hallmark signs is heavy sweating, which helps to cool the body down as it overheats. Nausea or vomiting is also a common symptom, indicating the body's response to overheating and dehydration. Excessive thirst is an important sign, as it reflects the body's need for more fluid to combat dehydration.

A high body temperature, however, is more characteristic of heat stroke rather than heat exhaustion. In heat exhaustion, the body temperature is typically elevated but not to the extent seen in heat stroke, where it can reach dangerously high levels. Thus, identifying high body temperature as a symptom aligns more accurately with heat stroke symptoms, making it the correct answer for which option is NOT a sign of heat exhaustion.