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: Viruses cause many human diseases.
answer:
Human Viruses.


question:
Fact: a nest is used for protecting young by birds.
answer:
bird nest.


question:
Fact: if an object is black then that object absorbs all visible light.
answer:

Light is radiation.