Question: Among person A , B , C , D , there is one SPY . Please catch the SPY based on the following information, A

Among person A, B, C, D, there is one SPY. Please catch the SPY based on the following information,
A says: I am not a SPY
B says: D is the SPY
C says: I am not a SPY
D says: A is the SPY
Only one of them is telling the truth.

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