We use "Accept my answer because I'm not going to tell you again" and then we ignore his constant question, he swithched from asking over and over again to "what did you say" soon after.
This is a form of Attention getting. She knows you will answer every question she will continue to ask.
There are others that you can expect to see:
These are the behaviors that we see to gain the following
Attention: Constant questioning or conversation including pointing out things in the room, sharing worries about weather, family or personal hygiene, noise
Power: Bringing other children’s circumstances into the conversation as in, “and when Bailey gets into trouble he will need to sit in time out.”
Revenge: Physical Aggression including spitting.
Display of inadequacy: I’m a bad boy, I make bad choices, I can’t do it
The best thing to do is be passive about it. Don't explode or acknowledge that you heard the question for the 2nd to 1000th time.
It's hard because we coax them to talk then we can't get them to stop talking. =}