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.
--------
Question: Category: A CHRISTMAS CAROL 
Clue: "A partridge in a pear tree"

Answer: "the twelve days of christmas"


Question: Category: TO PROTECT 
Clue: This "service" is best known for protecting the president, but also investigates forgery

Answer: the secret service


Question: Category: ALL ABOARD! 
Clue: Ride in restored 1930s passenger cars on the Oil Creek and Titusville Railroad in this state

Answer:
pennsylvania