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.

[EX Q]: Sentence: Hydrogen gas is generated by the reaction of nitric acid and elemental iron else. Question: Hydrogen gas is generated by the reaction of nitric acid and what else?
[EX A]: elemental iron

[EX Q]: Sentence: Density describes how much matter is in a certain amount of space. Question: What describes how much matter is in a certain amount of space?
[EX A]: density

[EX Q]: Sentence: Light retains its original color under water because frequency remains the same when light is refracted. Question: Light retains its original color under water because what remains the same when light is refracted?
[EX A]:
frequency