Detailed Instructions: You are given a list of queries separated by new line. Your job is to answer with the query that is the most well-formed or well-structured query in terms of grammar, punctuations, or spelling errors.
Q: What is these movie call roots about ?
What is the purpose of a default gateway address ?
What caarbohydrates makes up carbon dioxide ?
How many people like hannahmontana ?
A:

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
What is the purpose of a default gateway address ?