God comes to you and tells you that, from this day forward, you may only read ONE type of book–one genre–period, but you get to choose what it is. Classics, Science-Fiction, Mystery, Romance, Cookbooks, History, Business … you can choose, but you only get ONE.
I'd have to go with Classics i think. Mainly because it would allow me to cheat! after all, there are classics of philosophy, classics of science fiction, classics of poetry! and newer books become classics all the time. Don't mistake me; i really do enjoy classic literature in the normally termed form. I'm working on the 1001 Books list and that is mainly the "classic" classics. since my spreadsheet says i'd need to read 19 a year to finish that list if i live to be 78, it does give me a good bit to read.