Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: Convenience store is a small retail shop. Convenience store sells items like toiletries, newspapers, etc. One might need toiletries to get to a bathroom.
 The question and answer:
If one needed the bathroom they needed a key, to get it they had to also buy something from the what?
Options:
- school
- convenience store
- rest area
- mall
- theater
The answer is convenience store