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.

Input: Consider Input: Sentence: Precipitation are a natural process that allows water to return again to the earth’s surface. Question: What natural process allows water to return again to the earth’s surface?

Output: precipitation


Input: Consider Input: Sentence: The name of positive ion ion always comes first. Question: The name of which ion always comes first?

Output: positive ion


Input: Consider Input: Sentence: Most people can survive only a few days without water. Question: Most people can survive only a few days without what essential substance?


Output: water