Q: Where would a business man keep a plane ticket with other documents?
Options:
- briefcase
- boarding plane
- airport
- pocket
- shirt sleeve
A: briefcase
Explain how we arrive at this answer:

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
Explanation: Businessmen end to carry briefcases. They keep important documents in the briefcase. Plane ticket is an important document.