You are presented with the question "What is most often caused by exposure to solid particles and gases?" and the following answer choices: 
- syphilis
 - diabetes
 - contamination
 - scattered light
 - lung cancer
 - hair color
 - global warming
 - Pollution

Now knowing that lung cancer is most often caused by exposure to tobacco smoke and tobacco smoke consists of solid particles and gases, choose the best answer.


 

     lung cancer    