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: "W"HODUNNIT? 
Clue: He was the first U.S. president to be unanimously elected
george washington

Category: FLAGS 
Clue: Christopher Columbus' flag bore a cross with their initials on either side
ferdinand & isabella

Category: YOUR NUMBER'S UP 
Clue: NFL tight ends wear jerseys with number in this range

the 80s