In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

[EX Q]: Fact: a canyon forming occurs over a period of millions of years. Question: How long did it take the Grand Canyon to form? A?
[EX A]: very lengthy amount of time

[EX Q]: Fact: cutting down trees in a forest causes the number of trees to decrease in that forest. Question: cutting down trees in a forest causes the number of trees to decrease where?
[EX A]: timberland

[EX Q]: Fact: gills are used for breathing water by aquatic animals. Question: Which is more accurate:?
[EX A]:
sharks use gills to swim underwater for longer than humans can