John noticed that there was a lot of dust in the room. He cleaned off the place where food is served last.  Where might John have cleaned last?
Options:
- shelf
- library
- table
- fridge
- refrigerator
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
Food is served on table. Table gets dust on it. John might have cleaned the table last. So the final answer is table.