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: 1930s FILMS 
Clue: In this classic film, one of the characters tries to quote the Pythagorean theorem but gets it wrong
the wizard of oz

Category: ENGINEERING 
Clue: The first one, built in 1893, consisted of 2,200 tons of steel, rose 268 feet & had 36 cars each carrying 60 people
ferris wheel

Category: LEADING MEN OF THE MOVIES 
Clue: This actor who turned down the role of Dirty Harry played 142 leading roles, a Guinness record

john wayne