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: POTENT POTABLES 
Clue: This Mexican spirit is obtained by distilling pulque
tequila

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

Category: LAKES & RIVERS 
Clue: Body of water, currently crossed by the 1831 London Bridge

lake havasu