In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

Input: Consider Input: Fact: contact between rocks over long periods of time causes rocks to smooth. Question: A rock tumbler revolves to?

Output: smooth gemstones


Input: Consider Input: Fact: the ocean contains large amounts of salt water. Question: If a bucket of water from the sea is left out in the sun for long enough, all that will eventually remain in the bucket is?

Output: sodium


Input: Consider Input: Fact: photosynthesis makes food for the plant by converting carbon dioxide, water, and sunlight into carbohydrates. Question: Which of the following is never an element used to make carbohydrates for the plant?


Output: sand