Corn, soybeans, clover, chicory, alfalfa, winter wheat, turnips, sorghum among many others. Clover is probably the most general best answer.
Need more info to give a more specific answer.
Are you doing a food plot? How big? What other food sources are close? What part of season are you hunting (early, middle, late). And so on. There are a bunch of factors that can play into what is best to plant to attract deer.