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.

Example Input: Category: PRESIDENTIAL FIRSTS 
Clue: The first president to cross the Atlantic Ocean while in office, he did so to meet with other world leaders
Example Output: wilson

Example Input: Category: LAW ENFORCEMENT 
Clue: This police force developed from bands of Indian fighters who protected American settlers in Mexico
Example Output: the texas rangers

Example Input: Category: WORDS IN PHYSICS 
Clue: Also found before "pack" & "team", it's defined as increase in volume resulting from increase in temperature
Example Output:
expansion