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.

Q: Category: RIVERS 
Clue: In 1951 it was determined that this river's source was in the Sierra Parima of Venezuela

A: the orinoco
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Q: Category: THE VICE PRESIDENCY 
Clue: Cardiological term often used for the distance the vice president is "away" from the most powerful office in the land

A: heartbeat
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Q: Category: FIRST LADIES' RHYME TIME 
Clue: Mrs. Madison's tennis shots

A:
dolley\'s volleys
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