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.

[Q]: Fact: limestone is formed by water evaporating from a solution of water and minerals. Question: Limestone is formed by water evaporating from a solution of water and mineral and a hard sedimentary rock used as building material and for making?
[A]: cement


[Q]: Fact: thick feathers can be used for keeping warm. Question: Some birds have adapted to their cold environment by over time evolving to have thicker feathers in order to?
[A]: avoid freezing


[Q]: Fact: An example of reproduction is laying eggs. Question: A way to reproduce is to?
[A]:
produce ovum