TASK DEFINITION: In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
PROBLEM: Sentence: Most of food's chemical energy ultimately comes from sunlight. Question: Most of food's chemical energy ultimately comes from what source?

SOLUTION: sunlight

PROBLEM: Sentence: Particles of sand and rock are carried by longshore drift. Question: Particles of sand and what other substance are carried by longshore drift?

SOLUTION: rock

PROBLEM: Sentence: Electrons exist only where the wave is stable. Question: Electrons exist only where the wave is what?

SOLUTION:
stable