TASK DEFINITION: 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.
PROBLEM: Question: One example of matter is? 
Answer: water. 
Sentence: One example of matter is water.

SOLUTION: An example of matter is water.

PROBLEM: Question: What type of lens is thicker at the edges than it is in the middle? 
Answer: concave lens. 
Sentence: A concave lens is thicker at the edges than it is in the middle.

SOLUTION: A concave leans comparatively thin in the middle but outer corners are thicker.

PROBLEM: Question: If the buoyant force is greater than the force of gravity acting on a ship, what will happen to the ship? 
Answer: it will float. 
Sentence: If the buoyant force is greater than the force of gravity acting on a ship, it will float.

SOLUTION:
A ship can only float when the buoyant force is greater than the force of gravity acting on that ship.