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

[EX Q]: The newest, outer layers of secondary xylem are called sapwood.
[EX A]: What are the newest, outer layers of secondary xylem called?

[EX Q]: By using fructose can you prevent your ice cream from getting a sandy texture.
[EX A]: How can you prevent your ice cream from getting a sandy texture?

[EX Q]: Coal is the source of most electricity.
[EX A]:
What is the source of most electricity?