Answer the following question given this paragraph: 

You have ten times as many bacterial cells as human cells in your body. Luckily for you, most of these bacteria are harmless. However, some of them can cause disease. Any organism that causes disease is called a pathogen . Diseases caused by bacterial pathogens include food poisoning, strep throat, and Lyme disease.


Q: Any organism that causes disease is called what?

 Choices:

- a parasite

- a virus

- a microbe

- a pathogen

A:
a pathogen
