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: mountains are formed by volcanoes

Ex Output:
Which substance is likely present for the birth of a mountain?

Ex Input:
Fact: a phase change is when matter changes from one state into another state

Ex Output:
All the water vanishes from a small depression basked in sunlight on a paved road because of?

Ex Input:
Fact: pluto has not cleared its orbit

Ex Output:
The last celestial body in our solar system without an orbit is?