The constituents of automobile exhaust that can cause cancer is/are :

A. Oxides of nitrogen
B. Carbon monoxide
C. Polycyclic hydrocarbons
D. Lead
Answer» B. Carbon monoxide
Explanation: Lead is a naturally occuriing bluish-gray metal found in small amounts in the earth's crust. In the past, when lead was added to gasoline, breathing automobile exhaust was the major source of lead exposure for most people. Lead in the exhaust also contaminated the soil near roads. Another major source a exposure is old paint that contains lead. Lead has been found to be carcinogen. A substance that causes cancer or helps cancer grow is called a carcinogen.
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