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.

[Q]: Category: YOU GET AN "F" 
Clue: This type of cable contains threads of glass that transmit signals in the form of pulses of light
[A]: fiber optic


[Q]: Category: CLASSICAL MYTHOLOGY 
Clue: Achilles died after one of these weapons wounded him in the heel
[A]: an arrow


[Q]: Category: THE DIGESTIVE SYSTEM 
Clue: Gravity isn't required to move food down to your stomach; this process moves it down the esophagus
[A]:
peristalsis