There was a question that said choose the correct answer (it had 3 choices) and justify your answer. I couldn't think what I should do, nothing at all would come to mind. So I used proof by contradiction, I proved that the 2 choices were wrong so the last one would be the right one :P But I still haven't found out the normal answer, I forgot to ask my teacher.
Well that's probably why they think you answered the best out of everyone who sat the exam in the whole country. >|
I think he means the best answer may not be the right one, but he probably got it right from that answer, if not he'll probably get points for the answer anyway. That is if it works similar to the test I sat. .-. .