What does the Ottoman Empire have to do with my income taxes?

We did our income taxes last night in the middle of our turbo taxing, there was a question about an Ottoman Empire...really, there was, my husband saw it too, but he was too busy trying to finish up, that he just clicked along and I didn't get to investigate.
Does anyone know what that's all about?
I can find anything about it now, nor can I find it in the program.