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: WHAT A CARD! 
Clue: Ken Jennings used these briefly displayed items to get ready to play "Jeopardy!"

SOLUTION: flashcards

PROBLEM: Category: ADMIRALS 
Clue: Opposed to war with the U.S., he nevertheless planned the Japanese attack on Pearl Harbor

SOLUTION: isoroku yamamoto

PROBLEM: Category: "CHI" CHI 
Clue: A coarse, twilled cotton fabric

SOLUTION:
chino