Which of the following conditions should be cared for by immersing the person in cool water?

The appropriate response for heat-related conditions involves immersing an individual in cool water to effectively lower the body temperature. Heat stroke is a severe form of heat illness that occurs when the body's temperature regulation fails, leading to a rapid increase in core temperature. Immediate treatment is critical, as heat stroke can lead to organ damage or even death if not addressed quickly.

By immersing a person in cool water, the heat can be quickly dissipated from the body, helping to restore normal body temperature and prevent further complications. This method is more efficient than other cooling techniques such as applying cool cloths or ice packs, as it provides a more comprehensive approach to lowering body temperature.

In contrast, conditions like heat exhaustion, frostbite, and hypothermia require different forms of treatment that are not focused on immersion in cool water. Heat exhaustion may involve rest and hydration with cool fluids but does not necessitate immersion. Frostbite treatment typically involves gradual warming rather than immersion in water, which could cause further damage. Hypothermia requires warm, dry environments and gentle rewarming techniques, not cool water immersion, as this would exacerbate the condition. Thus, for heat stroke, cooling through immersion is the most effective and immediate treatment.