Generally I would think that any situation severe enough to cause someone to call a Mayday is not going to fix itself in enough time to allow this to unfold in the first place. Secondly if you are asked that in an exam as a question then the examiners need to have a good look at themselves and worry about the quality of real thoery being retained.
I myself would be looking for the aircraft to report operations normal or advise intentions such as expecting a normal app and landing or something. You can be pretty sure that if u make a mayday call and ATC hears it and you do make some comment as to the situation getting better you will be having the full crash service roll out for your arrival (we had a tender retired after its entire career with never firing foam in anger)at most controlled aerodromes anyway I would think.