Checkmate in 1 puzzle

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laurengoodkindchess

Hi! My name is Lauren Goodkind and I'm a chess YouTuber: https://www.youtube.com/user/chessdifference/,

Below is a puzzle for beginners.  How does white checkmate black in one move?  This position was taken from a  game that I recently played.    

mrtb411

Queen to go.

mrtb411

G4*