Presence of which of the following fuel gas in the exhaust fumes shows incomplete combustion of fuel?

Carbon monoxide and water vapour

Presence of which of the following fuel gas in the exhaust fumes shows

1.	Presence of which of the following fuel gas in the exhaust fumes shows incomplete combustion of fuel?
A.	Sulphur dioxide
B.	Carbon monoxide and water vapour
C.	Carbon monoxide
D.	Nitrogen dioxide
Answer» D. Nitrogen dioxide