In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

Let me give you an example: Tracy slept awkwardly on their new bed and was having some pain, so Tracy cracked her neck.
The answer to this example can be: What did Tracy do with her neck?
Here is why: The question asked is relevant and can be directly answered by referring to the phrase "so Tracy cracked her neck" from the passage.

OK. solve this:
My dad told me that it was time for me to go to the dentist. We went there once every year and it was now time to go there. I got in my car and I drove down to the dentist's office. I got checked in and they asked me to wait a while until the dentist could see me. While I waited, I looked at things on my phone and some of the magazines that were there. They called my name and I went back to a small room with a chair that I rested in. The assistants came in and cleaned my teeth with some of their tools. It was a long time to keep my mouth open, but I knew it was for the best. The dentist came in and told me that I didn't have any cavities and that I was good to go back home.
Answer:
When was the last time they had been to the dentist?