Which of the following is a symptom of heat exhaustion?

A. Dry skin: This is more typical of heat stroke, where the body fails to regulate temperature and sweating stops. B. Paranoia: Paranoia is not a hallmark of heat exhaustion; it may be seen in severe hyperthermia or neurologic conditions. C. Moist skin: In heat exhaustion, the person continues to sweat as the body tries to cool down, resulting in cool, moist skin. D. Hypervigilance: Not a classic sign of heat exhaustion - this term refers to increased alertness, not typically associated with this condition.