Definition: 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.
Input: Question: Which of the following combinations is a mixture rather than a compound? Answer: oxygen and nitrogen in air
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Oxygen and nitrogen in air of the following combinations is a mixture rather than a compound.