Just to reiterate what folks have pointed out here, all that matters is the flavor of the beer. It doesn't matter what ingredients went into it. So, if you can't taste any coconut, it should be entered as an IPA. If the coconut is noticeable, it should go into the herb/vegetable category (21A) - though botanically a fruit, coconuts are considered more nut/seed than fruit, so it doesn't belong in the fruit beer category (just like chili pepper beer doesn't go into the fruit beer category, even though, botanically, peppers are fruits)