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: LET'S DANCE 
Clue: Proverbially, "It Takes Two" to perform this Latin dance
Example Output: tango

Example Input: Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these
Example Output: neutrons

Example Input: Category: PRESIDENTIAL FIRSTS 
Clue: This New Yorker was the first president born after America declared its independence
Example Output:
martin van buren