Exposure to carbon monoxide ( from coal gas ) is extremely dangerous and can kill a patient because

Options

A. The compound carboxyhemoglobin (COHb) it forms with hemoglobin can gradually clot the blood resulting in circulatory failure
B. COHb Reduces the ability of blood for transport oxygen by rupturing a vast majority of erythrocytes
C. COHb Greatly modifies the structure of hemoglobin, thus making it lose its affinity for oxygen
D. None of the above

Answer

C

Explanation

The affinity of carbon monoxide is 200 times more than oxygen thus it modifies the structure of hemoglobin thus making it lose its affinity for oxygen.