Which of the following are the reasons/factors for exposure to benzene pollution?
1. Automobile exhaust
2. Tobacco smoke
3. Woodburning
4. Using varnished wooden furniture
5. Using products made of polyurethane
Select the correct answer using the code given below:
1. 1, 2 and 3 only
2. 2 and 4 only
3. 1, 3 and 4 only
4. 1, 2, 3, 4 and 5