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: When liquid water changes to water vapor it is called? 
Answer: evaporation. 
Sentence: When liquid water changes to water vapor it is called evaporation.

SOLUTION: Evaporation is the process by which liquid water can turn into liquid vapor.

PROBLEM: Question: Radioactive atoms, nuclear explosions, and stars produce what types of rays? 
Answer: gamma. 
Sentence: Radioactive atoms, nuclear explosions, and stars produce gamma rays.

SOLUTION: Gamma rays are produced by radioactive atoms, nuclear explosions, and stars.

PROBLEM: Question: What is a structure that is composed of one or more types of tissues? 
Answer: organ. 
Sentence: A(n) organ is a structure that is composed of one or more types of tissues.

SOLUTION:
An example of a structure that is composed of one or more types of tissues is an organ.