Which of the following are the reasons/factors for exposure to benzene pollution?1.Automobile exhaust2.Tobacco smoke3.Wood burning4.Using varnished wooden furniture5.Using products made of polyurethaneSelect the correct answer using the code given below:

1. A

   1, 2 and 3 only

   1, 2 and 3 only. Exhaust, tobacco smoke and wood smoke are keyed benzene sources. Varnish and polyurethane are not in the official trio.

2. B

   2 and 4 only

   2 and 4 only. Under-counts exhaust and wood; keeps varnish.

3. C

   1, 3 and 4 only

   1, 3 and 4 only. Mixes a miss and a drop.

4. D

   1, 2, 3, 4 and 5

   All five. 4 and 5 are not counted on this paper.

Summary. Official key is (a) 1, 2 and 3 only. Benzene exposure as keyed: automobile exhaust, tobacco smoke, wood burning. Varnished furniture and polyurethane goods are not in that official set.