In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

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

[EX Q]: Question: Where would a sand dune be out of the ordinary? Answer: Kansas.
[EX A]: sand dunes are made of sand

[EX Q]: Question: a lack of illumination would result in which of these? Answer: a student unable to view what he is writing.
[EX A]:
eyes are used for seeing by animals by sensing light