Given a scientific question, generate a correct answer to it.

Ex Input:
What is a compound that can form ions when it dissolves in water called?

Ex Output:
electrolyte

Ex Input:
Observations suggest that a force applied to an object is always applied by what?

Ex Output:
another object

Ex Input:
What is the generation of electricity using photovoltaic cells to split water molecules called?

Ex Output:
photoelectrolysis