instruction:
In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.
question:
Fact: cables are used for support by suspension bridges.
answer:
cables are metal.


question:
Fact: Some pelycosaurs gave rise to a group of animals called therapsids.
answer:
pelycosaurs.


question:
Fact: a ruler is used for measuring the length of an object.
answer:

Length of object.