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: The speed of sound depends on medium. Question: The speed of sound depends on what?

SOLUTION: medium

PROBLEM: 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?

SOLUTION: it contracts

PROBLEM: Sentence: Heart disease is the leading cause of death in the united states. Question: What is the leading cause of death in the united states?

SOLUTION:
heart disease