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.

[Q]: Fact: Collar cells have tiny hairs that trap the particles.
[A]: Collar cells tiny hairs.


[Q]: Fact: Kidney failure may be treated with dialysis.
[A]: Kidney failure.


[Q]: Fact: Constriction occurs when the muscular walls of blood vessels contract.
[A]:
blood vessel vein.