Without dragging this into what is really a separate topic, I've always had a beef with how things are taught. These tests and the so-called "wrong" (but could be right) answers really highlights the problem. Students tend to be taught that there is usually a "right" answer and, often, it is presented among a small number of alternative choices which leads them to believe that most things only have a few choices to consider and that one of them is "right."
My favorite example is "What is the square root of 4?" The most common reply is 2. However, that is not completely accurate! 2
or -2 is a far better choice but there are even some really creative alternatives as well (imaging the number 4 made out of 4x4 lumber, now pick it up and look at the very bottom and you should be able to see the square root of 4).
The point being, in "real" life (whatever the hell that is!), there can be many possible solutions to the same problem so I feel that creativity shouldn't be punished (and therefore subdued into non-use). Students should learn how to learn, be taught how to come up with possible answers and shown where to look for answers. I think this should take a far higher priority than simply using rote memorization of answers to example questions.