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.

Ex Input:
Fact: the circulatory system carries oxygen from the digestive and respiratory systems to the rest of the body

Ex Output:
the circulatory system carries oxygen from the digestive and respiratory systems to the rest of the what?


Ex Input:
Fact: cycles of day and night occur once per day

Ex Output:
Cycles of day and night occur how often in a day?


Ex Input:
Fact: the moon 's surface contains flat areas

Ex Output:

the lunar surface contains?