Here's a question: The person was nervously fumbling through the magazines while waiting to be called next, he could hear the whir of machines and instruments in the next room where?

Here are possible answers to this question:
- airport
- bed
- library
- kitchen
- dentist

I believe the correct choice is "dentist", here's why:


dentists would be the only selection which commonly use machines and instruments which create a whirling sound.