Yep - Always answer yes to this question, even if you've never been there. They sometimes ask who you have seen, this is where doing your homework pays off. Find a good review from about a year ago and tell them that name. The girls tend to change-out quickly, so the likelihood of being caught in that fib is slim.
There was one time, I used the name of a girl that was actually still there. You'd think I was busted, but instead the girl acted as if she hadn't seen me in a long time. I suspect she thought she didn't remember me and didn't want me to know she forgot. She made up for "forgetting me" and I got my first FS twofer!