Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Smaller size of ring will a summer drought cause in a tree.
[EX A]: What size of ring will a summer drought cause in a tree?

[EX Q]: Demagnetization is the process in which a magnet loses its magnetic properties.
[EX A]: What is the process called in which a magnet loses its magnetic properties?

[EX Q]: Beer brewers add yeast to the wort to to make alcohol.
[EX A]:
Why do beer brewers add yeast to the wort?