Fact 1: Scraping oneself on a contaminated object may cause infection.

Fact 2: Contact with infected blood, contaminated needles.

Given the two facts above, answer the question "Getting scraped with what can give oneself an infection?" with the following options: 
- deoxyribonucleic acid
 - a knife with sanitized dirt
 - Roundworms.
 - harmful substances
 - Roundworms
 - a clean needle
 - a clean scapel
 - an infected needle


 

        an infected needle 