instruction:
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: FICTIONAL BATTLES & WARS 
Clue: Juan Rico joins the mobile infantry to fight in the war against the invading alien "bugs" in this Heinlein novel
answer:
starship troopers


question:
Category: DIMENSIONS 
Clue: Don't lose the thread--there are 10 or so dimensions in this physics theory
answer:
string theory


question:
Category: HAIL TO THE CHIEF 
Clue: They're the 2 presidents born in Braintree, Massachusetts
answer:

john adams & john quincy adams