You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: I'M AUSTRALIAN 
Clue: In the 1910s Alexander MacRae responded to the growing beach culture by creating this swim brand
speedo

Category: THEIR FIRST FEATURE FILMS 
Clue: June Lockhart debuted as a Cratchit child in this 1938 film, with her real parents playing Mr. & Mrs. Bob Cratchit
a christmas carol

Category: 1970s ROCK 
Clue: Their 1973 hit about "The Cover of 'Rolling Stone'" landed them on the March 29th cover of Rolling Stone

dr. hook & the medicine show