Which of the following is a symptom of hypoxia?

Hypoxia occurs when the body or a region of the body is deprived of adequate oxygen supply. Cold flashes can be a symptom of hypoxia because the body begins to react to lower oxygen levels, which may alter circulation and lead to sensations of coldness. As oxygen levels drop, the brain and other vital organs may not receive the necessary oxygen to function properly, leading to various physiological responses, including feeling faint or experiencing temperature changes.

Other symptoms that are more commonly associated with hypoxia include increased heart rate as the body attempts to compensate for the lack of oxygen. Sweating and loss of balance may also occur in some instances, but cold flashes specifically indicate a physiological response to inadequate oxygenation, making it the chosen answer. Understanding these symptoms is critical for pilots, as recognizing hypoxia can prevent serious incidents during flight where oxygen levels might be compromised.