List the signs of Carbon Monoxide poisoning.

• A. Shortness of Breath, Mild Nausea, Mild Headache
• B. Severe Chest Pain, Rash, Fever
• C. Drowsiness, Blurred Vision, Diarrhea
• D. Numbness, Tingling, Difficulty Breathing

Answer: (A)

Carbon monoxide poisoning causes tissue hypoxia because carbon monoxide binds to hemoglobin much more strongly than oxygen, reducing oxygen delivery to the body's tissues. Early signs are nonspecific and often resemble flu-like symptoms, including headache, nausea, and shortness of breath. The combination of shortness of breath with mild nausea and a mild headache fits this pattern best, which is why that option is the correct choice. Other sets include symptoms not typical of CO poisoning—rash and fever suggest infection; diarrhea isn’t a typical CO symptom; numbness and tingling aren’t characteristic, though breathing difficulty can occur in severe exposure. If CO exposure is suspected, move to fresh air and seek medical help promptly.