You are presented with the question "what causes cancer by producing mutations in DNA?" and the following answer choices: 
- bacteria
 - h2o
 - Pesticides
 - cigarettes
 - asbestos
 - A computer
 - digestion
 - Toxicity

Now knowing that most carcinogens cause cancer by producing mutations in DNA and asbestos is a known carcinogen, choose the best answer.


 

     asbestos    