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: You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors. Question: What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?

A: superconductors
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Q: Sentence: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract. Question: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what?

A: contract
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Q: Sentence: Birds build nests to safe place. Question: Why do birds build nests?

A:
safe place
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