Enter U.S. Government Interest (DIV)

This screen during the 1099-DIV process asks "Enter the amount of the dividends reports on Form 1099-DIV for XXX that represents interest from US Government obligations." How do I know? Do mutual funds for municipals count? Isn't everything in box 11 (exempt-interest dividends) related to the government in one way or another? TT isn't being very descriptive here.