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: SUPERHEROES 
Clue: For a while the Hulk was gray, but now he's this color

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

A: the orinoco
****
Q: Category: A.K.A. 
Clue: This "Die Hard" co-star's real name is Bonnie Culkin; Macaulay is her nephew

A:
bonnie bedelia
****