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: Liquid nitrogen is used for cooling detectors of infrared telescopes. Question: What is used for cooling detectors of infrared telescopes?

A: liquid nitrogen
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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?

A: density
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Q: Sentence: You call the hard case that surrounds the soft parts of some animals the exoskeleton. Question: What do you call the hard case that surrounds the soft parts of some animals?

A:
exoskeleton
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