Use reasoning to lead to the answer of the following question:
Where can a calendar be purchased normally?
Options:
- office supply store
- desktop
- smart phone
- wrist watch
- date book
 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
Calendar is an office supply item. Office supply items are sold in an office supply store. An office supply store is a building. Therefore, the final answer is office supply store.