A patient on nitroprusside therapy developed cyanide toxicity. Sodium nitrite was administered i.v. to combat this poisoning. Beneficial effect of sodium nitrite in this case is dependent on:
A
Direct chelation of cyanide with sodium nitrite
B
Vasodilatation caused by sodium nitrite
C
Conversion of hemoglobin to methemoglobin by sodium nitrite
D
Facilitation of cyanocobalamin formation by sodium nitrite