TASK DEFINITION: In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.
PROBLEM: Question: During photosynthesis plants make their own? Answer: sustenance.

SOLUTION: a leaf performs photosynthesis

PROBLEM: Question: Pollution is a source of what? Answer: dirtying agents.

SOLUTION: pollution is a source of pollutants

PROBLEM: Question: Salt was at one time? Answer: currency.

SOLUTION:
adding salt to a solid decreases the freezing point of that solid