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Old 11-28-2019
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Default Repeated USMLE Questions Step 1- 276

A 64-year-old man complains of severe headache, dizziness, nausea and deterioration of vision. Workup shows a decrease in oxygen carrying capacity with no change in PO2 of arterial blood.
Which of the following is most likely responsible for this patient's symptoms?
A- Ozone
B- Carbon monoxide (CO)
C- Sulfur dioxide
D- Nitrogen
Answer
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