you're right. Qb4# is mate.
Checkmate is Incorrect?
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In Rey - Mar, 1986 Northern California Championships under Chess potpourri (http://www.chess.com/chessmentor/view_lesson?id=2350), the final move has four correct answers, all of which are mate in one. However, 7) Ka5, Qb4# is not an alternative correct answer; it is simply incorrect. Qa6# is also incorrect. The problem instead requires 7) Ka5, Ra1#, or 7) Ka5, b6#. This should be fixed.
EDIT: added another incorrect mate