Fact 1: Viruses are not cells.

Fact 2: Some smallpox viruses are maintained in laboratories.

Given the two facts above, answer the question "What is not a cell?" with the following options: 
- A computer
 - all matter
 - smallpox
 - an object
 - illness
 - bacteria
 - Most plants
 - hydrocarbons


 

   smallpox      