instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
A sifter can be used for separating flours.
answer:
What can a sifter be used for?


question:
ropes are used for support by the Golden Gate Bridge
answer:
What is used to support the Golden Gate Bridge?


question:
the volume of a crystal ball can be used to describe the dimensions of the crystal ball
answer:

What can be used to describe the dimensions of a crystal ball?