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.

Example Input: 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?
Example Output: density

Example Input: Sentence: Nucleic acids is defined by its sequence of nucleotides. Question: What is defined by its sequence of nucleotides?
Example Output: nucleic acids

Example Input: Sentence: Hydration reaction kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules. Question: What kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules?
Example Output:
hydration reaction