In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[EX Q]: Question: Which of these can be mined from Earth and used as an energy source? Answer: Coal
[EX A]: Coal can be mined from earth and used as an energy source.

[EX Q]: Question: All solutions contain at least how many substances? Answer: two
[EX A]: All solutions contain at least two substances.

[EX Q]: Question: What is made in the liver and excreted in urine? Answer: urea
[EX A]:
Urea is made in the liver and excreted in urine.