For this chain-of-thought reasoning and answer, what was the question?
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.
 A: convention center
Q: 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