Identify a characteristic symptom of exposure to chlorine gas.

Exposure to chlorine gas is primarily associated with respiratory distress and irritation of the eyes. Chlorine is a highly reactive chemical and can cause significant damage upon inhalation or contact with mucous membranes. When chlorine gas is inhaled, it irritates the respiratory tract, leading to symptoms such as coughing, shortness of breath, and a feeling of chest tightness. Additionally, chlorine can irritate the eyes, resulting in symptoms like tearing, redness, and a burning sensation.

These physiological responses are due to the corrosive nature of chlorine, which can react with moisture in the airways and eyes, forming hydrochloric acid and contributing to the irritation and inflammation of tissues. While headaches and nausea can occur from various exposures or conditions, they are not characteristic of chlorine exposure specifically. Similarly, dizziness and abdominal pain, as well as skin rashes and bleeding, are not typical responses to chlorine gas and are more indicative of other types of exposures or reactions. Therefore, respiratory distress and eye irritation are hallmark symptoms that signal exposure to chlorine gas.