I would pay Doulingo to add this option!
It gets very frustrating every time I practice a quiz where I strengthen my skills under time practice that I don't have time(obviously because of the timer) to check why my answer was wrong.
At the end of the quiz it gets even more frustrating that I can't check my answer with the discussion upon that specific sentence/word/question/whatever.
I am sure that this option would be very very useful for each of us
So what do you think Duolingo?
I often look at the discussion for a sentence/word/question by typing it into the search box on the discussion forum. That's not as quick as clicking a "discuss sentence" button, but it does allow me to review the discussion close in time to making a mistake on the quiz.