Q: What is the purpose of your body's first line of defense?


Read this paragraph and choose the correct option from the provided answers:

Your body’s first line of defense is like a castle’s moat and walls. It keeps most pathogens out of your body. The first line of defense includes physical, chemical, and biological barriers.

 Choices:

- reject foreign bodies

- fight or flight

- heal wounds

- to keep out pathogens


A:
to keep out pathogens