What is the number one selling IPA in America?

Excuse me, I was wondering if you could clarify something for me. I'm curious about the state of the beer market in America, specifically when it comes to IPA's. I've heard a lot about their popularity, but I'm not sure which one reigns supreme as the number one selling IPA in the country. Could you possibly shed some light on this matter for me? I'd greatly appreciate any information you might have.