*/*_Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog??

*/*_Which of the following emissions in the exhaust gas of an I.C. eng

1.	/_Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog??
A.	Nitrogen oxides
B.	Hydrocarbons
C.	Both A & B
D.	Carbon monoxide
Answer» D. Carbon monoxide