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.

[Q]: Sentence: Although it is the easiest to observe, color is not ideal as a sole way to identify minerals. Question: Although it is the easiest to observe, what property is not ideal as a sole way to identify minerals?
[A]: color


[Q]: Sentence: The mineral quartz is used to produce glass. Question: What mineral is used to produce glass?
[A]: quartz


[Q]: Sentence: Galaxy of these is last if ordered in increasing size: galaxy, solar system, star cluster. Question: Which of these is last if ordered in increasing size: galaxy, solar system, star cluster?
[A]:
galaxy