Answer the following question given this paragraph: 

A magnet is an object that attracts certain materials such as iron. All magnets have two magnetic poles and a magnetic field over which they exert force. Opposite magnetic poles attract each other, and like magnetic poles repel each other.


Q: What do you call an object that attracts certain materials such as iron?

 Choices:

- antenna

- neutron

- electron

- magnet

A:
magnet
