Heat stroke is best described as a dangerous condition in which the body loses its ability to cool itself through perspiration. Which option best reflects this?

• A. Fever due to infection
• B. Excessive sweating
• C. An inability to regulate body temperature due to failure of sweating
• D. Mild dehydration

Answer: (C)

Heat stroke occurs when the body's cooling system stops working properly, so core temperature rises to dangerous levels. Sweating is the main way the body loses heat through evaporation; when sweating fails or is inadequate, heat cannot be dissipated efficiently, leading to overheating. That makes the description of “an inability to regulate body temperature due to failure of sweating” the best match for heat stroke.

This differs from fever, which is a regulated rise in body temperature usually due to infection. It also isn’t simply excessive sweating or mild dehydration—the key idea is the failure of the body’s cooling mechanism through sweating. In real cases, heat stroke is a medical emergency, and rapid cooling and medical help are essential.