Which of the following symptoms indicates frostbite?

Numbness in the toes or fingers is a classic symptom of frostbite, as it indicates that the skin and underlying tissues are affected by extreme cold. When frostbite occurs, blood flow to the extremities is restricted, leading to tissue damage. This reduced blood flow can cause a loss of sensation in the affected areas, which manifests as numbness.

The other symptoms listed are indicative of other conditions related to cold exposure or hypothermia. Shivering is the body’s response to generate heat and does not directly signify frostbite. Confusion and rapid heartbeat can be signs of hypothermia, where the body is losing heat overall, but they are not specific indicators of frostbite, which specifically involves localized tissue damage due to freezing temperatures.