In my short time here, I've seen more and more members replying to a sample question on one of the GMAT forums with just an answer (A,B,C,D,E) and no explanation. This isn't really helpful at all considering the topic originator most likely already has the correct answer. Is there a way to form a new kind of topic, say 'Sample Question' and when someone tries to respond, they are given the 5 answer choices that they must choose from (like a poll-type question). Next, maybe there should be a box like you see when you reply, only this time making it a requirement that this must be filled in or the forum won't let you post your reply. I know this doesn't deter people from just putting the answer in the box, but maybe people will feel more obligated to provide a useful explanation?
Just a suggestion.