You are presented with the question "What is considered nonliving?" and the following answer choices: 
- Leptospirosis
 - major threat to health
 - smallest agent of disease
 - harmful substances
 - direct damage to the lungs
 - Food poisoning
 - an area swollen with pus
 - loses an electron

Now knowing that viruses are usually considered to be nonliving and viruses Viruses are the smallest agents of disease, choose the best answer.


 

   smallest agent of disease      