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 cactus stem is used for storing water. Question: Someone stranded in the Sahara can potentially save their life with a?
[EX A]: prickly plant's trunk

[EX 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?
[EX A]: cement

[EX Q]: Fact: as altitude increases , air pressure will decrease. Question: Rising air pressure means that I should bring?
[EX A]:
sunblock