Which of the following is a common symptom of carbon monoxide poisoning?

Nausea is a common symptom of carbon monoxide poisoning because this gas is a colorless, odorless substance that can replace oxygen in the blood, leading to hypoxia. When the body's tissues are deprived of oxygen, it can trigger various physiological responses, one of which is nausea. This sensation occurs as the body struggles to cope with the lack of oxygen and the subsequent buildup of carbon monoxide, which affects brain function and can induce feelings of illness.

The other options, such as increased appetite, enhanced vision, and hyperactivity, are not associated with carbon monoxide poisoning. Increased appetite typically indicates a healthy metabolic state, while enhanced vision and hyperactivity are not physiological responses linked with carbon monoxide exposure. Therefore, recognizing nausea as a symptom is critical for timely identification and intervention in potential poisoning situations.