Say, while smiling and looking at her intently.."Well, yes, I have girls who are friends..." Pause and smile. Pause and smile. And move on. Never give a straight answer if you are dating lots of others and if she persists say, "well, I am here with you now aren't I." Wink and move on. DO NOT LET HER PUSH. Let the ? drop to the floor. I mean just because she asks doesn't mean you have to answer. This is only true if you are playing around with her and want to keep your options open.
If not, then still be vague. If you want her as a girlfriend, you can use C& F and say, why are you interviewing for the position. This might work best for women.
But the pause and smile move works very well for any sticky situation. Again, pause and smile, pause and smile and move on to new topic. Like kissing her passionately. That will shut her up. If she likes you.