TASK DEFINITION: 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.
PROBLEM: 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?

SOLUTION: front

PROBLEM: Sentence: Acids are molecular compounds that dissolve in water to produce hydronium ions and an anion else. Question: Acids are molecular compounds that dissolve in water to produce hydronium ions and what else?

SOLUTION: an anion

PROBLEM: Sentence: Natural resource type of resource is limited in supply and cannot be replaced except over millions of years. Question: What type of resource is limited in supply and cannot be replaced except over millions of years?

SOLUTION:
natural resource