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 potential of galvanic cell can be used to measure the ph of a solution. Question: The potential of what can be used to measure the ph of a solution?

SOLUTION: galvanic cell

PROBLEM: Sentence: Lying with their mouths open, a behavior called gaping, probably serves the function of cooling down for crocodiles. Question: Lying with their mouths open, a behavior called gaping, probably serves what function for crocodiles?

SOLUTION: cooling down

PROBLEM: Sentence: Melted iron do scientist's believe mercury's core is mostly made of. Question: What do scientist's believe mercury's core is mostly made of?

SOLUTION:
melted iron