TASK DEFINITION: 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.
PROBLEM: Category: ALL ABOUT RIVERS
Clue: You may be waiting for the Robert E. Lee on a natural one of these raised river banks created by flood waters

SOLUTION: levee

PROBLEM: Category: CINEMA
Clue: Vangelis' theme from this 1981 British film took a record 21 weeks on the charts to reach No. 1

SOLUTION: "chariots of fire"

PROBLEM: Category: "C.C." SENOR!
Clue: Chalk is a naturally occurring form of this compound whose chemical formula is CaCO3

SOLUTION:
calcium carbonate