You are presented with the question "Getting scraped with what can give oneself an infection?" and the following answer choices: 
- deoxyribonucleic acid
 - a knife with sanitized dirt
 - Roundworms.
 - harmful substances
 - Roundworms
 - a clean needle
 - a clean scapel
 - an infected needle

Now knowing that scraping oneself on a contaminated object may cause infection and contact with infected blood, contaminated needles, choose the best answer.


 

        an infected needle 