Dan wondered where those ball bearings came from. Ball bearings are used in what sort of thing?
Options:
- support axial loads
- can
- allow movement
- machines
- church 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
Ball bearings are used in moving parts. Machines generally have moving parts.
So, the answer is machines.