The signs and symptoms of carbon monoxide poisoning may include

• A. headache, dizziness, nausea
• B. cough only
• C. rash
• D. stomach pain

Answer: (A)

Carbon monoxide poisoning most clearly shows signs that reflect reduced oxygen delivery to the brain and other organs. The early, classic combination is headache, dizziness, and nausea. CO binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin and preventing enough oxygen from reaching tissues. That tugs on brain function and can trigger headaches and dizziness, with nausea often accompanying as the body's systems struggle with low oxygen. The other options don’t fit as typical CO- poisoning signs: a cough is more typical of respiratory infections or irritation, a rash suggests an allergic or skin issue, and stomach pain isn’t a common primary symptom of CO exposure. If CO exposure is suspected, get fresh air and seek medical help promptly.