Four sons, Alex, Brian, Colin and Derek, bought together a single gift for their dad.
One of the boys hid the gift. Mom asked which of them had done it.
Alex and Brian: I did not do it.
Colin: Derek did it.
Derek: Brian did it.
Only one of the boys lied. Who of them hid the gift?
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As only one of them lied, we know that Alex and Brian didn't lie, meaning they didn't do it. However, Derek claims Brian did it, meaning Derek is the liar.
Colin is thus telling the truth and Derek is the one who hid it.