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What core body temperature indicates heat stroke?

  1. Above 35 degrees Celsius

  2. Above 37 degrees Celsius

  3. Above 40 degrees Celsius

  4. Above 42 degrees Celsius

The correct answer is: Above 40 degrees Celsius

A body temperature above 40 degrees Celsius is indicative of heat stroke, which is a potentially life-threatening condition. This temperature is significantly higher than the average normal body temperature of 37 degrees Celsius. Option A is incorrect because that body temperature is actually below the normal range. Option D is incorrect because it is an extremely high temperature that most likely would not be compatible with life. Option B falls within the normal range and may not necessarily indicate heat stroke.