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: Environmental contaminants is one problem with current methods of aluminum production. Question: What is one problem with current methods of aluminum production?

Output: environmental contaminants


Input: Consider Input: Sentence: In weather terms, the boundary between two air masses is called front. Question: In weather terms, what do you call the boundary between two air masses?

Output: front


Input: Consider Input: Sentence: Metal conducts heat and electricity so well because of free flowing electrons. Question: Why does metal conduct heat and electricity so well?


Output: free flowing electrons