The 反 reading is all good and merry, but the 応 reading gets a bit wonky, turning into のう. This is probably because it's just way easier to say than はんおう and sounds basically the same too. So, はんおう goes to はんのう and everyone's happy. Do you have a response?
The reading はんおう is also going to be included since it's technically correct though a less common spelling.
Could you tell me how to force quit an unresponsive application, please?