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: U.S. CURRENCY 
Clue: Of men pictured on currently printed paper money, he's the one most recently deceased

SOLUTION: ulysses s. grant

PROBLEM: Category: LAW ENFORCEMENT 
Clue: This police force developed from bands of Indian fighters who protected American settlers in Mexico

SOLUTION: the texas rangers

PROBLEM: Category: ODD TITLES 
Clue: Gilbert & Sullivan's "Mikado", not Milne, gave us this hyphenated title for a pompous functionary

SOLUTION:
grand poo-bah