Use reasoning to lead to the answer of the following question:
Joe was there to meet a large number of people. As he filed though the entrance hall, he saw many strangers who came from far away. What sort of building is he probably in?
Options:
- person
- box
- convention center
- public building
- large building
 Reasoning process:

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
Joe was in convention center where he meets a large number of people. He saw many strangers who came from far away in building called convention center. Therefore, the final answer is convention center.