TurboTax asks this to determine how much of the distribution is eligible for rollover. If it's all RMD, TurboTax won't ask how much was rolled over. Otherwise, TurboTax will only allow you to report as rolled over that portion that was not RMD.
This particular question has nothing to do with determining whether or not you satisfied your RMD. That's a separate question asked by TurboTax and has nothing to do with the reporting of any particular distribution.
