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.

[EX Q]: Category: POETIC LINES 
Clue: In a famous poem, this character asks, "If I can rid your town of rats will you give me a thousand guilders?"
[EX A]: the pied piper

[EX Q]: 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
[EX A]: starship troopers

[EX Q]: Category: ELECTRONICS 
Clue: It's the opposition of a material to electric current, resulting in heat or other forms of energy
[EX A]:
resistance