The ONLY reason that TurboTax asks the question during entry of a Form 1099-R is to help determine how much of the distribution is eligible for rollover. Substitute "ineligible for rollover" for "RMD" in this question being posed by TurboTax and it will make more sense.
Of course there are some distributions that are not eligible for rollover even if they are not RMDs, so the question as asked really doesn't do a good job of accomplishing what it is intended to do.
