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.

Example Input: Fact: biofuel is used to produce electricity by burning
Example Output: An example of biofuel could be?

Example Input: Fact: An example of migration is birds flying south in the winter
Example Output: Birds go south to look for?

Example Input: Fact: a beach ball contains gas
Example Output:
What could be used to fill a beach ball?