Originally Posted by TheRussNope, it's starch, which is a complex carbohydrate.
For information about the glycemic index of different types of rice, see this study. I've already commented on it at some length here and here, but for the purposes of this thread, here's the short version:
Most types of rice will drive up your blood sugar fairly quickly. If you aren't actively trying to do this, you're probably better off eating another type of grain that's digested more slowly.