Where was he one speaker of many?
Options:
- drive in movie
- shelf
- conference
- lecture hall
- demonstration
Let's think carefully first. Step-by-step 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
The one speaker of many was at conference. So the final answer is conference.