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.
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Question: Category: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota

Answer: the mississippi


Question: Category: THE FICTIONAL LAND OF OZ 
Clue: This paving material of the road to the Emerald City is in need of repairs

Answer: yellow brick


Question: Category: PUBS & TAVERNS 
Clue: The Last Drop Tavern was named for its proximity to the spot where public hangings took place in this Scottish capital

Answer:
edinburgh