If one needed the bathroom they needed a key, to get it they had to also buy something from the what?\nOptions:\n- school\n- convenience store\n- rest area\n- mall\n- theater
Let's think carefully first. Step-by-step reasoning process:
User
Convenience store is a small retail shop. Convenience store sells items like toiletries, newspapers, etc. One might need toiletries to get to a bathroom. So the final answer is convenience store.
Assistant