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: VOLCANOES 
Clue: The 5 highest volcanoes on Earth are located in these mountains

Answer: andes


Question: Category: TRAINS 
Clue: As of 2006, you can take a 48-hr. ride between these 2 cities, with a stretch on the world's highest railroad

Answer: beijing & lhasa


Question: Category: ROCK PERFORMERS 
Clue: 2 of 4 performing duos inducted into the Rock and Roll Hall of Fame

Answer:
the everly brothers, ike & tina turner, sam & dave &/or simon & garfunkel