A. Methane
A.
B. Carbon Monoxide
B.
C. Nitrous oxide
C.
D. Carbon dioxide
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Hemoglobin in humans has a very high affinity for carbon monoxide, forming carboxyhemoglobin which is a very bright red in color. Carbon monoxide is thus problematic for humans because it has affinity higher than that of oxygen.