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 state of matter has the lowest density? Answer: gases
[EX A]: Gases have the lowest density.

[EX Q]: Question: Where are protons and neutrons located? Answer: central nucleus
[EX A]: Protons and neutrons are located in the central nucleus.

[EX Q]: Question: What part of the brain lies under the cerebrum and behind the brain stem? Answer: cerebellum
[EX A]:
The cerebellum of the brain lies under the cerebrum and behind the brain stem.