Final answer:
The statement is true; in the song 'Mack the Knife,' the character Mack wields a knife.
Step-by-step explanation:
The question seems to be a reference to the song 'Mack the Knife' where the character Mack, also known as Macheath, is known for wielding a knife. If the 5-letter word being referred to is 'knife', then the statement is True: In song, the 5-letter word was wielded by Mack. This line comes from the song 'Mack the Knife', which was made famous in the United States by Bobby Darin and has its origins in a German song from The Three penny Opera, composed by Kurt Weill with lyrics by Bertolt Brecht.