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: Combustion reaction occurs when a substance reacts quickly with oxygen. Question: What occurs when a substance reacts quickly with oxygen?
[EX A]: combustion reaction

[EX Q]: Sentence: Oxygen has increased in the atmosphere throughout the history of the earth. Question: What has increased in the atmosphere throughout the history of the earth?
[EX A]: oxygen

[EX Q]: Sentence: The properties of the alkali metals are similar to each other as expected for elements in the same family. Question: The properties of the alkali metals are similar to each other as expected for elements in the same what?
[EX A]:
family