Answer the following question given this paragraph: 

Many species have a feeding structure, the radula , found only in mollusks. The radula can be thought of as a "tongue-like" structure. The radula is made mostly of chitin. Types of radulae range from structures used to scrape algae off of rocks to the beaks of squid and octopuses.


Q: What is the radula made mostly of?

 Choices:

- casein

- chlorophyll

- schist

- chitin

A:
chitin
