EXEMPTED LAZY PANTS riddle:))riddle me this....?

A professor tells his students that they only have one question for their test tomorrow.The next day,he asks his students,"How can you make me believe that this chair in front of me is invisible?".The students took 2 to 3 hours to answer that question except for one lazy student who took only 5 seconds to answer the question.The next day when the results came out,the lazy student got the highest score...:)



Q:What did the lazy student answer????
 
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