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: MYTHOLOGY 
Clue: This Norse god known for his great strength was a protector of peasants & farmers

SOLUTION: thor

PROBLEM: Category: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota

SOLUTION: the mississippi

PROBLEM: Category: DESIGN 
Clue: Persia's animal art persisted even after the introduction of this religion that forbade making images

SOLUTION:
islam