Can a professor copyright a question he asks on a test? Would posting test Q&A be a violation of copyright?

Here is an example. Lets say a professor asks a question on a test: "What is Dynamic Memory Allocation?" Can he copyright this question? The answer can be seen as copyrighted but that isn't a problem because the submission of the answer was made by the original author (in this case the student who... show more Here is an example. Lets say a professor asks a question on a test: "What is Dynamic Memory Allocation?" Can he copyright this question? The answer can be seen as copyrighted but that isn't a problem because the submission of the answer was made by the original author (in this case the student who took the test).
Update: From the responses if have received, it seems that if the question is unique enough then the professor has rights to it. Is there any way to display the answer the student wrote that implies the question? Would this approach still be considered copyright infringement of the professor?
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