If you love to speak in public, make sure your excitement about it comes through in your answer by talking about times in the past you've been given the opportunity to speak to a group and how you felt doing it. If you have a fear of public speaking, let the interviewer know if you are willing to try and overcome it or if it is something you are not open to.

"I'll be honest, I'm terrified of speaking in front of large groups. I get nervous and shaky and forget what I was going to say. I'd love to get past it though and become a confident public speaker. I've looked into joining a local Toastmasters chapter and would do so if public speaking would be a useful skillset for this position."