Underage of a person means too young to engage legally in a particular activity, especially drinking alcohol or having sex. Someone of underage is not legal to buy alcohol.is the reasoning for what question and answer pair?

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
Q: What is someone not legal to buy alcohol?
Options:
- underage
- banned
- adult
- rules
- black market
A: underage