Which statement about heat-related illnesses is true according to the material?

• A. Heat stroke results from the failure of the body's temperature-regulating capacity
• B. Heat exhaustion is not a recognized condition
• C. Heat stroke occurs due to dehydration only
• D. Heat exhaustion is always life-threatening

Answer: (A)

Heat stroke happens when the body's temperature-regulating capacity fails, so the person can no longer dissipate heat effectively. This failure is what makes heat stroke the most dangerous heat-related illness, often with altered mental status and very high core temperatures requiring urgent cooling and medical care. The other statements don’t fit because heat exhaustion is a recognized condition (not “not recognized”), heat stroke is not caused only by dehydration ( dehydration may contribute but the core issue is regulatory failure), and heat exhaustion is not always life-threatening (it is typically less severe than heat stroke).