instruction:
Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.
question:
Fact: acid rain has a negative impact on water quality
answer:
If it starts raining acid rain you should?


question:
Fact: a cactus stem is used for storing water
answer:
Someone stranded in the Sahara can potentially save their life with a?


question:
Fact: a tape measure is used to measure length
answer:

with which could you tell the exact size of an object?