Answer the following question given this paragraph: 

The ocean floor is home to many species of living things. Some from shallow water are used by people for food. Clams and some fish are among the many foods we get from the ocean floor. Some living things on the ocean floor are sources of human medicines. For example, certain bacteria on the ocean floor produce chemicals that fight cancer.


Q: Some living things on the ocean floor are sources of what human necessity?

 Choices:

- hormones

- steroids

- pesticides

- medicines

A:
medicines
