Whom to trust?

Logic Level 2

As a spy, James Bond has 2 informants that submit tips anonymously. He knows that one of them has completely trustworthy information, but the other is not always perfectly accurate. He asked them to figure out if statements W, X, Y, Z, and received the following reports:

Report A:
Exactly one of W, X, Y is true.
Exactly one of X, Y, Z is true.
Exactly one of W, Z is false.


Report B:
Exactly one of W, X, Y is true.
Exactly one of X, Y, Z is true.
Exactly one of W, Y, Z is true.

Which report is NOT trustworthy?

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