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 base of a nucleotide within dna consists of nitrogen. Question: What does the base of a nucleotide within dna consist of?

SOLUTION: nitrogen

PROBLEM: Sentence: The composition of the atmosphere has changed over the last 200 years primarily due to human activity. Question: Which of the following has changed over the last 200 years primarily due to human activity?

SOLUTION: the composition of the atmosphere

PROBLEM: Sentence: Collisions between hydrogen atoms demonstrate one form of nuclear fusion. Question: Collisions between hydrogen atoms demonstrate one form of what?

SOLUTION:
nuclear fusion