One suggestíon from my side, if you like it :--> Sometimes, answer is chosen as best but actually it is not a correct one and lacks good information. If soméone checks it, then its okk that could be corrected, but if it is not checked forever. I gives wrong information who see them .
So, I think best answer should be available only to a few,i.e only few people should have the authority to mark it as best ( specially who are moderators or who already have cracked GATE exam and not all the editors ).
Even i have sometimes marked it as best and you have corrected the answer many times, it makes a good learning though by correcting the mistakes but also it is not possible for u to look each and every answer, so if that answer is missed, negatives are awarded in exam.
So, I think marking best should be only available to some, not all .