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: What is one problem with current methods of aluminum production? Answer: environmental contaminants
[EX A]: Environmental contaminants is one problem with current methods of aluminum production.

[EX Q]: Question: Carbon dioxide does not rise like other gases because it has a density greater than what? Answer: air
[EX A]: Carbon dioxide does not rise like other gases because it has a density greater than air.

[EX Q]: Question: How many different main types of diabetes are there? Answer: two
[EX A]:
There are two different main types of diabetes.