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.

Sentence: When the core of a star begins to run low on hydrogen, it contracts. Question: What happens to the core of a star when it begins to run low on hydrogen?
it contracts

Sentence: Streak is a more reliable trait or measure to identify minerals. Question: Which is a more reliable trait or measure to identify minerals?
streak

Sentence: During phase change, the temperature of a system remains constant. Question: What happens to the temperature of a system during phase change?
remains constant