He feels like just a cog in a machine or just a number in a cubicle when he is working where?
Options:
- planner
- math book
- office
- mathematics
- phonebook Hmmm, let me think.

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
Cubicles are found in a office. One works in the office.
So, the answer is office.