You are given a question, its answer, and a sentence that supports the question, i.e., the answer to the question is inferable from the sentence. In this task, you need to paraphrase the given sentence so that the paraphrased sentence still supports the question i.e. you can still infer the answer to the question from the paraphrased sentence. Do not write a paraphrase with a minor change in the given sentence e.g. replacing the word "one" with "a". Instead, try to write a paraphrase that contains new words, i.e. the words that are not present in the input sentence.

Question: What do metals start out as? 
Answer: ore. 
Sentence: Metals start out as ore.
Metals are refined from the base material they start as, called ore.

Question: Which of the following planets is always closer to the Sun than it is to Earth? 
Answer: Mercury. 
Sentence: Mercury is always closer to the sun than it is to earth.
Always closer to the sun than it is the earth, the planet Mercury is closer to the sun.

Question: Reversible reactions are indicated by what kinds of arrows? 
Answer: opposite-headed. 
Sentence: Reversible reactions are indicated by opposite-headed kinds of arrows.

If we see the opposite-headed arrows then the reaction is said to be reversible reaction.

