Oz in Jeopardy!

When they revealed the categories for the Double Jeopardy! round of the June 26, 2018 match, two categories looked promising for Oz clues. Alas, nothing about The Wiz or Wicked in Broadway Musicals, but sure enough, the very first clue in Unreal Estate, for $400, was this:

Jeff, the challenger in the middle, rang in first and correctly responded, "What is the Emerald City?" Unfortunately, this was an evenly fought match with a challenging Final Jeopardy, so the final scores were very low. Even with that, Jeff finished a distant third.