Answer the following question given this paragraph: 

Cartilage is a tough, flexible connective tissue that contains the protein collagen. It covers the ends of bones where they meet. The gray tissue in Figure below is cartilage.


Q: What is the term for  tough, flexible connective tissue that contains the protein collagen?

 Choices:

- muscle

- cuticle

- membrane

- cartilage

A:
cartilage
